dcerpc schannel operations
Copyright (C) Andrew Tridgell 2004
-
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+ Copyright (C) Rafal Szczesniak 2006
+
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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
+#include <tevent.h>
+#include "auth/auth.h"
+#include "libcli/composite/composite.h"
+#include "libcli/auth/libcli_auth.h"
+#include "librpc/gen_ndr/ndr_netlogon.h"
+#include "librpc/gen_ndr/ndr_netlogon_c.h"
+#include "auth/credentials/credentials.h"
+#include "librpc/rpc/dcerpc_proto.h"
+#include "param/param.h"
+
+struct schannel_key_state {
+ struct dcerpc_pipe *pipe;
+ struct dcerpc_pipe *pipe2;
+ struct dcerpc_binding *binding;
+ bool dcerpc_schannel_auto;
+ struct cli_credentials *credentials;
+ struct netlogon_creds_CredentialState *creds;
+ uint32_t local_negotiate_flags;
+ uint32_t remote_negotiate_flags;
+ struct netr_Credential credentials1;
+ struct netr_Credential credentials2;
+ struct netr_Credential credentials3;
+ struct netr_ServerReqChallenge r;
+ struct netr_ServerAuthenticate2 a;
+ const struct samr_Password *mach_pwd;
+};
+
+
+static void continue_secondary_connection(struct composite_context *ctx);
+static void continue_bind_auth_none(struct composite_context *ctx);
+static void continue_srv_challenge(struct tevent_req *subreq);
+static void continue_srv_auth2(struct tevent_req *subreq);
+static void continue_get_capabilities(struct tevent_req *subreq);
+
/*
- wrappers for the schannel_*() functions
+ Stage 2 of schannel_key: Receive endpoint mapping and request secondary
+ rpc connection
*/
-static NTSTATUS schan_unseal_packet(struct dcerpc_security *dcerpc_security,
- TALLOC_CTX *mem_ctx,
- uint8_t *data, size_t length, DATA_BLOB *sig)
+static void continue_epm_map_binding(struct composite_context *ctx)
{
- struct schannel_state *schannel_state = dcerpc_security->private;
- return schannel_unseal_packet(schannel_state, mem_ctx, data, length, sig);
-}
+ struct composite_context *c;
+ struct schannel_key_state *s;
+ struct composite_context *sec_conn_req;
+
+ c = talloc_get_type(ctx->async.private_data, struct composite_context);
+ s = talloc_get_type(c->private_data, struct schannel_key_state);
+
+ /* receive endpoint mapping */
+ c->status = dcerpc_epm_map_binding_recv(ctx);
+ if (!NT_STATUS_IS_OK(c->status)) {
+ DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
+ NDR_NETLOGON_UUID, nt_errstr(c->status)));
+ composite_error(c, c->status);
+ return;
+ }
-static NTSTATUS schan_check_packet(struct dcerpc_security *dcerpc_security,
- TALLOC_CTX *mem_ctx,
- const uint8_t *data, size_t length,
- const DATA_BLOB *sig)
-{
- struct schannel_state *schannel_state = dcerpc_security->private;
- return schannel_check_packet(schannel_state, data, length, sig);
-}
+ /* send a request for secondary rpc connection */
+ sec_conn_req = dcerpc_secondary_connection_send(s->pipe,
+ s->binding);
+ if (composite_nomem(sec_conn_req, c)) return;
-static NTSTATUS schan_seal_packet(struct dcerpc_security *dcerpc_security,
- TALLOC_CTX *mem_ctx,
- uint8_t *data, size_t length,
- DATA_BLOB *sig)
-{
- struct schannel_state *schannel_state = dcerpc_security->private;
- return schannel_seal_packet(schannel_state, mem_ctx, data, length, sig);
+ composite_continue(c, sec_conn_req, continue_secondary_connection, c);
}
-static NTSTATUS schan_sign_packet(struct dcerpc_security *dcerpc_security,
- TALLOC_CTX *mem_ctx,
- const uint8_t *data, size_t length,
- DATA_BLOB *sig)
-{
- struct schannel_state *schannel_state = dcerpc_security->private;
- return schannel_sign_packet(schannel_state, mem_ctx, data, length, sig);
-}
-static NTSTATUS schan_session_key(struct dcerpc_security *dcerpc_security,
- DATA_BLOB *session_key)
+/*
+ Stage 3 of schannel_key: Receive secondary rpc connection and perform
+ non-authenticated bind request
+*/
+static void continue_secondary_connection(struct composite_context *ctx)
{
- return NT_STATUS_NOT_IMPLEMENTED;
-}
+ struct composite_context *c;
+ struct schannel_key_state *s;
+ struct composite_context *auth_none_req;
-static void schan_security_end(struct dcerpc_security *dcerpc_security)
-{
- struct schannel_state *schannel_state = dcerpc_security->private;
- schannel_end(&schannel_state);
+ c = talloc_get_type(ctx->async.private_data, struct composite_context);
+ s = talloc_get_type(c->private_data, struct schannel_key_state);
+
+ /* receive secondary rpc connection */
+ c->status = dcerpc_secondary_connection_recv(ctx, &s->pipe2);
+ if (!composite_is_ok(c)) return;
+
+ talloc_steal(s, s->pipe2);
+
+ /* initiate a non-authenticated bind */
+ auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe2, &ndr_table_netlogon);
+ if (composite_nomem(auth_none_req, c)) return;
+
+ composite_continue(c, auth_none_req, continue_bind_auth_none, c);
}
/*
- get a schannel key using a netlogon challenge on a secondary pipe
+ Stage 4 of schannel_key: Receive non-authenticated bind and get
+ a netlogon challenge
*/
-NTSTATUS dcerpc_schannel_key(struct dcerpc_pipe *p,
- const char *domain,
- const char *username,
- const char *password,
- int chan_type,
- uint8_t new_session_key[8])
+static void continue_bind_auth_none(struct composite_context *ctx)
{
- NTSTATUS status;
- struct dcerpc_pipe *p2;
- struct netr_ServerReqChallenge r;
- struct netr_ServerAuthenticate2 a;
- struct netr_Credential credentials1, credentials2, credentials3;
- struct samr_Password mach_pwd;
- struct creds_CredentialState creds;
- const char *workgroup, *workstation;
- uint32_t negotiate_flags = 0;
+ struct composite_context *c;
+ struct schannel_key_state *s;
+ struct tevent_req *subreq;
- workstation = username;
- workgroup = domain;
+ c = talloc_get_type(ctx->async.private_data, struct composite_context);
+ s = talloc_get_type(c->private_data, struct schannel_key_state);
+
+ /* receive result of non-authenticated bind request */
+ c->status = dcerpc_bind_auth_none_recv(ctx);
+ if (!composite_is_ok(c)) return;
+
+ /* prepare a challenge request */
+ s->r.in.server_name = talloc_asprintf(c, "\\\\%s", dcerpc_server_name(s->pipe));
+ if (composite_nomem(s->r.in.server_name, c)) return;
+ s->r.in.computer_name = cli_credentials_get_workstation(s->credentials);
+ s->r.in.credentials = &s->credentials1;
+ s->r.out.return_credentials = &s->credentials2;
+
+ generate_random_buffer(s->credentials1.data, sizeof(s->credentials1.data));
/*
- step 1 - establish a netlogon connection, with no authentication
+ request a netlogon challenge - a rpc request over opened secondary pipe
*/
- status = dcerpc_secondary_smb(p, &p2,
- DCERPC_NETLOGON_NAME,
- DCERPC_NETLOGON_UUID,
- DCERPC_NETLOGON_VERSION);
+ subreq = dcerpc_netr_ServerReqChallenge_r_send(s, c->event_ctx,
+ s->pipe2->binding_handle,
+ &s->r);
+ if (composite_nomem(subreq, c)) return;
+
+ tevent_req_set_callback(subreq, continue_srv_challenge, c);
+}
+/*
+ Stage 5 of schannel_key: Receive a challenge and perform authentication
+ on the netlogon pipe
+*/
+static void continue_srv_challenge(struct tevent_req *subreq)
+{
+ struct composite_context *c;
+ struct schannel_key_state *s;
+
+ c = tevent_req_callback_data(subreq, struct composite_context);
+ s = talloc_get_type(c->private_data, struct schannel_key_state);
+
+ /* receive rpc request result - netlogon challenge */
+ c->status = dcerpc_netr_ServerReqChallenge_r_recv(subreq, s);
+ TALLOC_FREE(subreq);
+ if (!composite_is_ok(c)) return;
+
+ /* prepare credentials for auth2 request */
+ s->mach_pwd = cli_credentials_get_nt_hash(s->credentials, c);
+
+ /* auth2 request arguments */
+ s->a.in.server_name = s->r.in.server_name;
+ s->a.in.account_name = cli_credentials_get_username(s->credentials);
+ s->a.in.secure_channel_type =
+ cli_credentials_get_secure_channel_type(s->credentials);
+ s->a.in.computer_name = cli_credentials_get_workstation(s->credentials);
+ s->a.in.negotiate_flags = &s->local_negotiate_flags;
+ s->a.in.credentials = &s->credentials3;
+ s->a.out.negotiate_flags = &s->remote_negotiate_flags;
+ s->a.out.return_credentials = &s->credentials3;
+
+ s->creds = netlogon_creds_client_init(s,
+ s->a.in.account_name,
+ s->a.in.computer_name,
+ s->a.in.secure_channel_type,
+ &s->credentials1, &s->credentials2,
+ s->mach_pwd, &s->credentials3,
+ s->local_negotiate_flags);
+ if (composite_nomem(s->creds, c)) {
+ return;
+ }
/*
- step 2 - request a netlogon challenge
+ authenticate on the netlogon pipe - a rpc request over secondary pipe
*/
- r.in.server_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dcerpc_server_name(p));
- r.in.computer_name = workstation;
- r.in.credentials = &credentials1;
- r.out.credentials = &credentials2;
+ subreq = dcerpc_netr_ServerAuthenticate2_r_send(s, c->event_ctx,
+ s->pipe2->binding_handle,
+ &s->a);
+ if (composite_nomem(subreq, c)) return;
+
+ tevent_req_set_callback(subreq, continue_srv_auth2, c);
+}
- generate_random_buffer(credentials1.data, sizeof(credentials1.data), False);
- status = dcerpc_netr_ServerReqChallenge(p2, p->mem_ctx, &r);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
+/*
+ Stage 6 of schannel_key: Receive authentication request result and verify
+ received credentials
+*/
+static void continue_srv_auth2(struct tevent_req *subreq)
+{
+ struct composite_context *c;
+ struct schannel_key_state *s;
+
+ c = tevent_req_callback_data(subreq, struct composite_context);
+ s = talloc_get_type(c->private_data, struct schannel_key_state);
+
+ /* receive rpc request result - auth2 credentials */
+ c->status = dcerpc_netr_ServerAuthenticate2_r_recv(subreq, s);
+ TALLOC_FREE(subreq);
+ if (!composite_is_ok(c)) return;
+
+ if (!NT_STATUS_EQUAL(s->a.out.result, NT_STATUS_ACCESS_DENIED) &&
+ !NT_STATUS_IS_OK(s->a.out.result)) {
+ composite_error(c, s->a.out.result);
+ return;
}
/*
- step 3 - authenticate on the netlogon pipe
- */
- E_md4hash(password, mach_pwd.hash);
- creds_client_init(&creds, &credentials1, &credentials2, &mach_pwd, &credentials3,
- negotiate_flags);
-
- a.in.server_name = r.in.server_name;
- a.in.account_name = talloc_asprintf(p->mem_ctx, "%s$", workstation);
- a.in.secure_channel_type = chan_type;
- a.in.computer_name = workstation;
- a.in.negotiate_flags = &negotiate_flags;
- a.out.negotiate_flags = &negotiate_flags;
- a.in.credentials = &credentials3;
- a.out.credentials = &credentials3;
-
- status = dcerpc_netr_ServerAuthenticate2(p2, p->mem_ctx, &a);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
+ * Strong keys could be unsupported (NT4) or disables. So retry with the
+ * flags returned by the server. - asn
+ */
+ if (NT_STATUS_EQUAL(s->a.out.result, NT_STATUS_ACCESS_DENIED)) {
+ uint32_t lf = s->local_negotiate_flags;
+ const char *ln = NULL;
+ uint32_t rf = s->remote_negotiate_flags;
+ const char *rn = NULL;
+
+ if (!s->dcerpc_schannel_auto) {
+ composite_error(c, s->a.out.result);
+ return;
+ }
+ s->dcerpc_schannel_auto = false;
+
+ if (lf & NETLOGON_NEG_SUPPORTS_AES) {
+ ln = "aes";
+ if (rf & NETLOGON_NEG_SUPPORTS_AES) {
+ composite_error(c, s->a.out.result);
+ return;
+ }
+ } else if (lf & NETLOGON_NEG_STRONG_KEYS) {
+ ln = "strong";
+ if (rf & NETLOGON_NEG_STRONG_KEYS) {
+ composite_error(c, s->a.out.result);
+ return;
+ }
+ } else {
+ ln = "des";
+ }
+
+ if (rf & NETLOGON_NEG_SUPPORTS_AES) {
+ rn = "aes";
+ } else if (rf & NETLOGON_NEG_STRONG_KEYS) {
+ rn = "strong";
+ } else {
+ rn = "des";
+ }
+
+ DEBUG(3, ("Server doesn't support %s keys, downgrade to %s"
+ "and retry! local[0x%08X] remote[0x%08X]\n",
+ ln, rn, lf, rf));
+
+ s->local_negotiate_flags = s->remote_negotiate_flags;
+
+ generate_random_buffer(s->credentials1.data,
+ sizeof(s->credentials1.data));
+
+ subreq = dcerpc_netr_ServerReqChallenge_r_send(s,
+ c->event_ctx,
+ s->pipe2->binding_handle,
+ &s->r);
+ if (composite_nomem(subreq, c)) return;
+
+ tevent_req_set_callback(subreq, continue_srv_challenge, c);
+ return;
}
- if (!creds_client_check(&creds, a.out.credentials)) {
- return NT_STATUS_UNSUCCESSFUL;
+ s->creds->negotiate_flags = s->remote_negotiate_flags;
+
+ /* verify credentials */
+ if (!netlogon_creds_client_check(s->creds, s->a.out.return_credentials)) {
+ composite_error(c, NT_STATUS_UNSUCCESSFUL);
+ return;
}
- /*
- the schannel session key is now in creds.session_key
+ /* setup current netlogon credentials */
+ cli_credentials_set_netlogon_creds(s->credentials, s->creds);
- we no longer need the netlogon pipe open
- */
- dcerpc_pipe_close(p2);
+ composite_done(c);
+}
+
+/*
+ Initiate establishing a schannel key using netlogon challenge
+ on a secondary pipe
+*/
+struct composite_context *dcerpc_schannel_key_send(TALLOC_CTX *mem_ctx,
+ struct dcerpc_pipe *p,
+ struct cli_credentials *credentials,
+ struct loadparm_context *lp_ctx)
+{
+ struct composite_context *c;
+ struct schannel_key_state *s;
+ struct composite_context *epm_map_req;
+ enum netr_SchannelType schannel_type = cli_credentials_get_secure_channel_type(credentials);
+
+ /* composite context allocation and setup */
+ c = composite_create(mem_ctx, p->conn->event_ctx);
+ if (c == NULL) return NULL;
+
+ s = talloc_zero(c, struct schannel_key_state);
+ if (composite_nomem(s, c)) return c;
+ c->private_data = s;
+
+ /* store parameters in the state structure */
+ s->pipe = p;
+ s->credentials = credentials;
+ s->local_negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
+
+ /* allocate credentials */
+ if (s->pipe->conn->flags & DCERPC_SCHANNEL_128) {
+ s->local_negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
+ }
+ if (s->pipe->conn->flags & DCERPC_SCHANNEL_AES) {
+ s->local_negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
+ s->local_negotiate_flags |= NETLOGON_NEG_SUPPORTS_AES;
+ }
+ if (s->pipe->conn->flags & DCERPC_SCHANNEL_AUTO) {
+ s->local_negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
+ s->local_negotiate_flags |= NETLOGON_NEG_SUPPORTS_AES;
+ s->dcerpc_schannel_auto = true;
+ }
+
+ /* type of authentication depends on schannel type */
+ if (schannel_type == SEC_CHAN_RODC) {
+ s->local_negotiate_flags |= NETLOGON_NEG_RODC_PASSTHROUGH;
+ }
+
+ /* allocate binding structure */
+ s->binding = talloc_zero(c, struct dcerpc_binding);
+ if (composite_nomem(s->binding, c)) return c;
- memcpy(new_session_key, creds.session_key, 8);
+ *s->binding = *s->pipe->binding;
- return NT_STATUS_OK;
+ /* request the netlogon endpoint mapping */
+ epm_map_req = dcerpc_epm_map_binding_send(c, s->binding,
+ &ndr_table_netlogon,
+ s->pipe->conn->event_ctx,
+ lp_ctx);
+ if (composite_nomem(epm_map_req, c)) return c;
+
+ composite_continue(c, epm_map_req, continue_epm_map_binding, c);
+ return c;
}
/*
- do a schannel style bind on a dcerpc pipe with the given schannel
- key. The username is usually of the form HOSTNAME$ and the password
- is the domain trust password
-*/
-NTSTATUS dcerpc_bind_auth_schannel_key(struct dcerpc_pipe *p,
- const char *uuid, uint_t version,
- const char *domain,
- const char *username,
- const uint8_t session_key[8])
+ Receive result of schannel key request
+ */
+NTSTATUS dcerpc_schannel_key_recv(struct composite_context *c)
{
- NTSTATUS status;
- uint8_t full_session_key[16];
- struct schannel_state *schannel_state;
- const char *workgroup, *workstation;
- struct dcerpc_bind_schannel bind_schannel;
+ NTSTATUS status = composite_wait(c);
+
+ talloc_free(c);
+ return status;
+}
- memcpy(full_session_key, session_key, 8);
- memset(full_session_key+8, 0, 8);
- workstation = username;
- workgroup = domain;
+struct auth_schannel_state {
+ struct dcerpc_pipe *pipe;
+ struct cli_credentials *credentials;
+ const struct ndr_interface_table *table;
+ struct loadparm_context *lp_ctx;
+ uint8_t auth_level;
+ struct netlogon_creds_CredentialState *creds_state;
+ struct netlogon_creds_CredentialState save_creds_state;
+ struct netr_Authenticator auth;
+ struct netr_Authenticator return_auth;
+ union netr_Capabilities capabilities;
+ struct netr_LogonGetCapabilities c;
+};
- /*
- perform a bind with security type schannel
- */
- p->auth_info = talloc(p->mem_ctx, sizeof(*p->auth_info));
- if (!p->auth_info) {
- status = NT_STATUS_NO_MEMORY;
- goto done;
+
+static void continue_bind_auth(struct composite_context *ctx);
+
+
+/*
+ Stage 2 of auth_schannel: Receive schannel key and intitiate an
+ authenticated bind using received credentials
+ */
+static void continue_schannel_key(struct composite_context *ctx)
+{
+ struct composite_context *auth_req;
+ struct composite_context *c = talloc_get_type(ctx->async.private_data,
+ struct composite_context);
+ struct auth_schannel_state *s = talloc_get_type(c->private_data,
+ struct auth_schannel_state);
+ NTSTATUS status;
+
+ /* receive schannel key */
+ status = c->status = dcerpc_schannel_key_recv(ctx);
+ if (!composite_is_ok(c)) {
+ DEBUG(1, ("Failed to setup credentials: %s\n", nt_errstr(status)));
+ return;
}
- p->auth_info->auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
+ /* send bind auth request with received creds */
+ auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table, s->credentials,
+ lpcfg_gensec_settings(c, s->lp_ctx),
+ DCERPC_AUTH_TYPE_SCHANNEL, s->auth_level,
+ NULL);
+ if (composite_nomem(auth_req, c)) return;
- if (p->flags & DCERPC_SEAL) {
- p->auth_info->auth_level = DCERPC_AUTH_LEVEL_PRIVACY;
- } else {
- /* note that DCERPC_AUTH_LEVEL_NONE does not make any
- sense, and would be rejected by the server */
- p->auth_info->auth_level = DCERPC_AUTH_LEVEL_INTEGRITY;
- }
- p->auth_info->auth_pad_length = 0;
- p->auth_info->auth_reserved = 0;
- p->auth_info->auth_context_id = random();
- p->security_state = NULL;
-
- /* TODO: what are these?? */
- bind_schannel.unknown1 = 0;
- bind_schannel.unknown2 = 3;
- bind_schannel.domain = workgroup;
- bind_schannel.hostname = workstation;
-
- status = ndr_push_struct_blob(&p->auth_info->credentials, p->mem_ctx, &bind_schannel,
- (ndr_push_flags_fn_t)ndr_push_dcerpc_bind_schannel);
- if (!NT_STATUS_IS_OK(status)) {
- goto done;
+ composite_continue(c, auth_req, continue_bind_auth, c);
+}
+
+
+/*
+ Stage 3 of auth_schannel: Receivce result of authenticated bind
+ and say if we're done ok.
+*/
+static void continue_bind_auth(struct composite_context *ctx)
+{
+ struct composite_context *c = talloc_get_type(ctx->async.private_data,
+ struct composite_context);
+ struct auth_schannel_state *s = talloc_get_type(c->private_data,
+ struct auth_schannel_state);
+ struct tevent_req *subreq;
+
+ c->status = dcerpc_bind_auth_recv(ctx);
+ if (!composite_is_ok(c)) return;
+
+ /* if we have a AES encrypted connection, verify the capabilities */
+ if (ndr_syntax_id_equal(&s->table->syntax_id,
+ &ndr_table_netlogon.syntax_id)) {
+ ZERO_STRUCT(s->return_auth);
+
+ s->creds_state = cli_credentials_get_netlogon_creds(s->credentials);
+ if (composite_nomem(s->creds_state, c)) return;
+
+ s->save_creds_state = *s->creds_state;
+ netlogon_creds_client_authenticator(&s->save_creds_state, &s->auth);
+
+ s->c.in.server_name = talloc_asprintf(c,
+ "\\\\%s",
+ dcerpc_server_name(s->pipe));
+ if (composite_nomem(s->c.in.server_name, c)) return;
+ s->c.in.computer_name = cli_credentials_get_workstation(s->credentials);
+ s->c.in.credential = &s->auth;
+ s->c.in.return_authenticator = &s->return_auth;
+ s->c.in.query_level = 1;
+
+ s->c.out.capabilities = &s->capabilities;
+ s->c.out.return_authenticator = &s->return_auth;
+
+ DEBUG(5, ("We established a AES connection, verifying logon "
+ "capabilities\n"));
+
+ subreq = dcerpc_netr_LogonGetCapabilities_r_send(s,
+ c->event_ctx,
+ s->pipe->binding_handle,
+ &s->c);
+ if (composite_nomem(subreq, c)) return;
+
+ tevent_req_set_callback(subreq, continue_get_capabilities, c);
+ return;
}
- /* send the authenticated bind request */
- status = dcerpc_bind_byuuid(p, p->mem_ctx, uuid, version);
- if (!NT_STATUS_IS_OK(status)) {
- goto done;
+ composite_done(c);
+}
+
+/*
+ Stage 4 of auth_schannel: Get the Logon Capablities and verify them.
+*/
+static void continue_get_capabilities(struct tevent_req *subreq)
+{
+ struct composite_context *c;
+ struct auth_schannel_state *s;
+
+ c = tevent_req_callback_data(subreq, struct composite_context);
+ s = talloc_get_type(c->private_data, struct auth_schannel_state);
+
+ /* receive rpc request result */
+ c->status = dcerpc_netr_LogonGetCapabilities_r_recv(subreq, s);
+ TALLOC_FREE(subreq);
+ if (NT_STATUS_EQUAL(c->status, NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE)) {
+ if (s->creds_state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
+ composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
+ return;
+ } else {
+ /* This is probably NT */
+ composite_done(c);
+ return;
+ }
+ } else if (!composite_is_ok(c)) {
+ return;
}
- p->security_state = talloc_p(p->mem_ctx, struct dcerpc_security);
- if (!p->security_state) {
- status = NT_STATUS_NO_MEMORY;
- goto done;
+ if (NT_STATUS_EQUAL(s->c.out.result, NT_STATUS_NOT_IMPLEMENTED)) {
+ if (s->creds_state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
+ /* This means AES isn't supported. */
+ composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
+ return;
+ }
+
+ /* This is probably an old Samba version */
+ composite_done(c);
+ return;
}
- schannel_state = talloc_p(p->mem_ctx, struct schannel_state);
- if (!schannel_state) {
- status = NT_STATUS_NO_MEMORY;
- goto done;
+ /* verify credentials */
+ if (!netlogon_creds_client_check(&s->save_creds_state,
+ &s->c.out.return_authenticator->cred)) {
+ composite_error(c, NT_STATUS_UNSUCCESSFUL);
+ return;
}
- status = schannel_start(&schannel_state, full_session_key, True);
- if (!NT_STATUS_IS_OK(status)) {
- goto done;
+ *s->creds_state = s->save_creds_state;
+
+ if (!NT_STATUS_IS_OK(s->c.out.result)) {
+ composite_error(c, s->c.out.result);
+ return;
}
- dump_data_pw("session key:\n", schannel_state->session_key, 16);
+ /* compare capabilities */
+ if (s->creds_state->negotiate_flags != s->capabilities.server_capabilities) {
+ DEBUG(2, ("The client capabilities don't match the server "
+ "capabilities: local[0x%08X] remote[0x%08X]\n",
+ s->creds_state->negotiate_flags,
+ s->capabilities.server_capabilities));
+ composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
+ return;
+ }
- p->security_state->private = schannel_state;
- p->security_state->unseal_packet = schan_unseal_packet;
- p->security_state->check_packet = schan_check_packet;
- p->security_state->seal_packet = schan_seal_packet;
- p->security_state->sign_packet = schan_sign_packet;
- p->security_state->session_key = schan_session_key;
- p->security_state->security_end = schan_security_end;
+ /* TODO: Add downgrade dectection. */
-done:
- return status;
+ composite_done(c);
}
/*
- do a schannel style bind on a dcerpc pipe. The username is usually
- of the form HOSTNAME$ and the password is the domain trust password
+ Initiate schannel authentication request
*/
-NTSTATUS dcerpc_bind_auth_schannel(struct dcerpc_pipe *p,
- const char *uuid, uint_t version,
- const char *domain,
- const char *username,
- const char *password)
+struct composite_context *dcerpc_bind_auth_schannel_send(TALLOC_CTX *tmp_ctx,
+ struct dcerpc_pipe *p,
+ const struct ndr_interface_table *table,
+ struct cli_credentials *credentials,
+ struct loadparm_context *lp_ctx,
+ uint8_t auth_level)
{
- NTSTATUS status;
- uint8_t session_key[8];
+ struct composite_context *c;
+ struct auth_schannel_state *s;
+ struct composite_context *schan_key_req;
- status = dcerpc_schannel_key(p, domain, username, password,
- lp_server_role() == ROLE_DOMAIN_BDC? SEC_CHAN_BDC:SEC_CHAN_WKSTA,
- session_key);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
+ /* composite context allocation and setup */
+ c = composite_create(tmp_ctx, p->conn->event_ctx);
+ if (c == NULL) return NULL;
+
+ s = talloc_zero(c, struct auth_schannel_state);
+ if (composite_nomem(s, c)) return c;
+ c->private_data = s;
+
+ /* store parameters in the state structure */
+ s->pipe = p;
+ s->credentials = credentials;
+ s->table = table;
+ s->auth_level = auth_level;
+ s->lp_ctx = lp_ctx;
+
+ /* start getting schannel key first */
+ schan_key_req = dcerpc_schannel_key_send(c, p, credentials, lp_ctx);
+ if (composite_nomem(schan_key_req, c)) return c;
+
+ composite_continue(c, schan_key_req, continue_schannel_key, c);
+ return c;
+}
- status = dcerpc_bind_auth_schannel_key(p, uuid, version, domain, username, session_key);
+/*
+ Receive result of schannel authentication request
+*/
+NTSTATUS dcerpc_bind_auth_schannel_recv(struct composite_context *c)
+{
+ NTSTATUS status = composite_wait(c);
+
+ talloc_free(c);
return status;
}
+
+/*
+ Perform schannel authenticated bind - sync version
+ */
+_PUBLIC_ NTSTATUS dcerpc_bind_auth_schannel(TALLOC_CTX *tmp_ctx,
+ struct dcerpc_pipe *p,
+ const struct ndr_interface_table *table,
+ struct cli_credentials *credentials,
+ struct loadparm_context *lp_ctx,
+ uint8_t auth_level)
+{
+ struct composite_context *c;
+
+ c = dcerpc_bind_auth_schannel_send(tmp_ctx, p, table, credentials, lp_ctx,
+ auth_level);
+ return dcerpc_bind_auth_schannel_recv(c);
+}
git.samba.org / metze / samba / wip.git / blobdiff