dcerpc schannel operations
Copyright (C) Andrew Tridgell 2004
-
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+
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 2 of the License, or
*/
#include "includes.h"
-
-enum schannel_position {
- DCERPC_SCHANNEL_STATE_START = 0,
- DCERPC_SCHANNEL_STATE_UPDATE_1
-};
-
-struct dcerpc_schannel_state {
- TALLOC_CTX *mem_ctx;
- enum schannel_position state;
- struct schannel_state *schannel_state;
- struct creds_CredentialState creds;
- char *account_name;
-};
-
-static 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[16]);
+#include "auth/auth.h"
/*
- wrappers for the schannel_*() functions
-
- These will become static again, when we get dynamic registration, and
- decrpc_schannel_security_ops come back here.
+ get a schannel key using a netlogon challenge on a secondary pipe
*/
-static NTSTATUS dcerpc_schannel_unseal_packet(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- uint8_t *data, size_t length, DATA_BLOB *sig)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
-
- return schannel_unseal_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
-}
-
-static NTSTATUS dcerpc_schannel_check_packet(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- const uint8_t *data, size_t length,
- const DATA_BLOB *sig)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
-
- return schannel_check_packet(dce_schan_state->schannel_state, data, length, sig);
-}
-
-static NTSTATUS dcerpc_schannel_seal_packet(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- uint8_t *data, size_t length,
- DATA_BLOB *sig)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
-
- return schannel_seal_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
-}
-
-static NTSTATUS dcerpc_schannel_sign_packet(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- const uint8_t *data, size_t length,
- DATA_BLOB *sig)
+static NTSTATUS dcerpc_schannel_key(TALLOC_CTX *tmp_ctx,
+ struct dcerpc_pipe *p,
+ struct cli_credentials *credentials)
{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
-
- return schannel_sign_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
-}
-
-static NTSTATUS dcerpc_schannel_session_key(struct gensec_security *gensec_security,
- DATA_BLOB *session_key)
-{
- return NT_STATUS_NOT_IMPLEMENTED;
-}
-
-static NTSTATUS dcerpc_schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB in, DATA_BLOB *out)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
NTSTATUS status;
- struct schannel_bind bind_schannel;
- struct schannel_bind_ack bind_schannel_ack;
- const char *account_name;
- *out = data_blob(NULL, 0);
-
- switch (gensec_security->gensec_role) {
- case GENSEC_CLIENT:
- if (dce_schan_state->state != DCERPC_SCHANNEL_STATE_START) {
- /* we could parse the bind ack, but we don't know what it is yet */
- return NT_STATUS_OK;
- }
-
- bind_schannel.unknown1 = 0;
-#if 0
- /* to support this we'd need to have access to the full domain name */
- bind_schannel.bind_type = 23;
- bind_schannel.u.info23.domain = gensec_security->user.domain;
- bind_schannel.u.info23.account_name = gensec_security->user.name;
- bind_schannel.u.info23.dnsdomain = str_format_nbt_domain(out_mem_ctx, fulldomainname);
- bind_schannel.u.info23.workstation = str_format_nbt_domain(out_mem_ctx, gensec_security->user.name);
-#else
- bind_schannel.bind_type = 3;
- bind_schannel.u.info3.domain = gensec_security->user.domain;
- bind_schannel.u.info3.account_name = gensec_security->user.name;
-#endif
-
- status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
- (ndr_push_flags_fn_t)ndr_push_schannel_bind);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(3, ("Could not create schannel bind: %s\n",
- nt_errstr(status)));
- return status;
- }
-
- dce_schan_state->state = DCERPC_SCHANNEL_STATE_UPDATE_1;
-
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
- case GENSEC_SERVER:
-
- if (dce_schan_state->state != DCERPC_SCHANNEL_STATE_START) {
- /* no third leg on this protocol */
- return NT_STATUS_INVALID_PARAMETER;
- }
-
- /* parse the schannel startup blob */
- status = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
- (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
-
- if (bind_schannel.bind_type == 23) {
- account_name = bind_schannel.u.info23.account_name;
- } else {
- account_name = bind_schannel.u.info3.account_name;
- }
-
- /* pull the session key for this client */
- status = schannel_fetch_session_key(out_mem_ctx, account_name, &dce_schan_state->creds);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(3, ("Could not find session key for attempted schannel connection on %s: %s\n",
- account_name, nt_errstr(status)));
- return status;
- }
-
- dce_schan_state->account_name = talloc_strdup(dce_schan_state->mem_ctx, account_name);
-
- /* start up the schannel server code */
- status = schannel_start(&dce_schan_state->schannel_state,
- dce_schan_state->creds.session_key, False);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(3, ("Could not initialise schannel state for account %s: %s\n",
- account_name, nt_errstr(status)));
- return status;
- }
-
- bind_schannel_ack.unknown1 = 1;
- bind_schannel_ack.unknown2 = 0;
- bind_schannel_ack.unknown3 = 0x6c0000;
-
- status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
- (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(3, ("Could not return schannel bind ack for account %s: %s\n",
- account_name, nt_errstr(status)));
- return status;
- }
-
- dce_schan_state->state = DCERPC_SCHANNEL_STATE_UPDATE_1;
-
- return NT_STATUS_OK;
- }
- return NT_STATUS_INVALID_PARAMETER;
-}
-
-/**
- * Return the credentials of a logged on user, including session keys
- * etc.
- *
- * Only valid after a successful authentication
- *
- * May only be called once per authentication.
- *
- */
-
-NTSTATUS dcerpc_schannel_session_info(struct gensec_security *gensec_security,
- struct auth_session_info **session_info)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
- TALLOC_CTX *mem_ctx;
- mem_ctx = talloc_init("dcerpc_schannel_start");
- if (!mem_ctx) {
- return NT_STATUS_NO_MEMORY;
- }
-
- (*session_info) = talloc_p(mem_ctx, struct auth_session_info);
- if (*session_info == NULL) {
- talloc_destroy(mem_ctx);
- return NT_STATUS_NO_MEMORY;
- }
-
- ZERO_STRUCTP(*session_info);
- (*session_info)->mem_ctx = mem_ctx;
- (*session_info)->refcount = 1;
-
- (*session_info)->workstation = talloc_strdup(mem_ctx, dce_schan_state->account_name);
- if ((*session_info)->workstation == NULL) {
- talloc_destroy(mem_ctx);
- return NT_STATUS_NO_MEMORY;
- }
- return NT_STATUS_OK;
-}
-
-
-/**
- * Return the struct creds_CredentialState.
- *
- * Make sure not to call this unless gensec is using schannel...
- */
-
-NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- struct creds_CredentialState **creds)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
-
- *creds = talloc_p(mem_ctx, struct creds_CredentialState);
- if (!*creds) {
- return NT_STATUS_NO_MEMORY;
- }
-
- **creds = dce_schan_state->creds;
- return NT_STATUS_OK;
-}
-
-
-static NTSTATUS dcerpc_schannel_start(struct gensec_security *gensec_security)
-{
- struct dcerpc_schannel_state *dce_schan_state;
- TALLOC_CTX *mem_ctx;
- mem_ctx = talloc_init("dcerpc_schannel_start");
- if (!mem_ctx) {
+ struct dcerpc_binding *b;
+ struct dcerpc_pipe *p2;
+ struct netr_ServerReqChallenge r;
+ struct netr_ServerAuthenticate2 a;
+ struct netr_Credential credentials1, credentials2, credentials3;
+ const struct samr_Password *mach_pwd;
+ uint32_t negotiate_flags;
+ struct creds_CredentialState *creds;
+ creds = talloc(tmp_ctx, struct creds_CredentialState);
+ if (!creds) {
return NT_STATUS_NO_MEMORY;
}
- dce_schan_state = talloc_p(mem_ctx, struct dcerpc_schannel_state);
- if (!dce_schan_state) {
- talloc_destroy(mem_ctx);
- return NT_STATUS_NO_MEMORY;
+ if (p->conn->flags & DCERPC_SCHANNEL_128) {
+ negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
+ } else {
+ negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
}
- dce_schan_state->mem_ctx = mem_ctx;
- dce_schan_state->state = DCERPC_SCHANNEL_STATE_START;
-
-
- gensec_security->private_data = dce_schan_state;
-
- return NT_STATUS_OK;
-}
-
-static NTSTATUS dcerpc_schannel_server_start(struct gensec_security *gensec_security)
-{
- NTSTATUS status;
-
- status = dcerpc_schannel_start(gensec_security);
+ /*
+ step 1 - establish a netlogon connection, with no authentication
+ */
+ /* Find the original binding string */
+ status = dcerpc_parse_binding(tmp_ctx, p->conn->binding_string, &b);
if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("Failed to parse dcerpc binding '%s'\n", p->conn->binding_string));
return status;
}
- return NT_STATUS_OK;
-}
-static NTSTATUS dcerpc_schannel_client_start(struct gensec_security *gensec_security)
-{
- NTSTATUS status;
- struct dcerpc_schannel_state *dce_schan_state;
-
- status = dcerpc_schannel_start(gensec_security);
+ /* Make binding string for netlogon, not the other pipe */
+ status = dcerpc_epm_map_binding(tmp_ctx, b,
+ &dcerpc_table_netlogon,
+ p->conn->event_ctx);
if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
+ DCERPC_NETLOGON_UUID, nt_errstr(status)));
return status;
}
- dce_schan_state = gensec_security->private_data;
- status = schannel_start(&dce_schan_state->schannel_state,
- gensec_security->user.schan_session_key,
- True);
+ status = dcerpc_secondary_connection(p, &p2, b);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Failed to start schannel client\n"));
return status;
}
- dump_data_pw("session key:\n", dce_schan_state->schannel_state->session_key, 16);
- return NT_STATUS_OK;
-}
-
-/*
- end crypto state
-*/
-static void dcerpc_schannel_end(struct gensec_security *gensec_security)
-{
- struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
-
- schannel_end(&dce_schan_state->schannel_state);
-
- talloc_destroy(dce_schan_state->mem_ctx);
-
- gensec_security->private_data = NULL;
-}
-
-
-/*
- get a schannel key using a netlogon challenge on a secondary pipe
-*/
-static 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[16])
-{
- 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;
-
- if (p->flags & DCERPC_SCHANNEL_128) {
- negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
- } else {
- negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
- }
-
- workstation = username;
- workgroup = domain;
-
- /*
- step 1 - establish a netlogon connection, with no authentication
- */
- status = dcerpc_secondary_connection(p, &p2,
- DCERPC_NETLOGON_NAME,
- DCERPC_NETLOGON_UUID,
- DCERPC_NETLOGON_VERSION);
-
+ status = dcerpc_bind_auth_none(p2, &dcerpc_table_netlogon);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(p2);
+ return status;
+ }
/*
step 2 - request a netlogon challenge
*/
- r.in.server_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dcerpc_server_name(p));
- r.in.computer_name = workstation;
+ r.in.server_name = talloc_asprintf(tmp_ctx, "\\\\%s", dcerpc_server_name(p));
+ r.in.computer_name = cli_credentials_get_workstation(credentials);
r.in.credentials = &credentials1;
r.out.credentials = &credentials2;
generate_random_buffer(credentials1.data, sizeof(credentials1.data));
- status = dcerpc_netr_ServerReqChallenge(p2, p->mem_ctx, &r);
+ status = dcerpc_netr_ServerReqChallenge(p2, tmp_ctx, &r);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
/*
step 3 - authenticate on the netlogon pipe
*/
- E_md4hash(password, mach_pwd.hash);
- creds_client_init(&creds, &credentials1, &credentials2, &mach_pwd, &credentials3,
+ mach_pwd = cli_credentials_get_nt_hash(credentials, tmp_ctx);
+
+ 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$", workstation);
- a.in.secure_channel_type = chan_type;
- a.in.computer_name = workstation;
+ a.in.account_name = cli_credentials_get_username(credentials);
+ a.in.secure_channel_type =
+ cli_credentials_get_secure_channel_type(credentials);
+ a.in.computer_name = cli_credentials_get_workstation(credentials);
a.in.negotiate_flags = &negotiate_flags;
a.out.negotiate_flags = &negotiate_flags;
a.in.credentials = &credentials3;
a.out.credentials = &credentials3;
- status = dcerpc_netr_ServerAuthenticate2(p2, p->mem_ctx, &a);
+ status = dcerpc_netr_ServerAuthenticate2(p2, tmp_ctx, &a);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
- if (!creds_client_check(&creds, a.out.credentials)) {
+ if (!creds_client_check(creds, a.out.credentials)) {
return NT_STATUS_UNSUCCESSFUL;
}
+ cli_credentials_set_netlogon_creds(credentials, creds);
+
/*
the schannel session key is now in creds.session_key
we no longer need the netlogon pipe open
*/
- dcerpc_pipe_close(p2);
-
- memcpy(new_session_key, creds.session_key, 16);
+ talloc_free(p2);
return NT_STATUS_OK;
}
-/*
- do a schannel style bind on a dcerpc pipe. The username is usually
- of the form HOSTNAME$ and the password is the domain trust password
-*/
-NTSTATUS dcerpc_bind_auth_schannel(struct dcerpc_pipe *p,
- const char *uuid, uint_t version,
- const char *domain,
- const char *username,
- const char *password)
+NTSTATUS dcerpc_bind_auth_schannel(TALLOC_CTX *tmp_ctx,
+ struct dcerpc_pipe *p,
+ const struct dcerpc_interface_table *table,
+ struct cli_credentials *credentials)
{
NTSTATUS status;
- int chan_type = 0;
-
- status = gensec_client_start(&p->security_state.generic_state);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
-
- if (p->flags & DCERPC_SCHANNEL_BDC) {
- chan_type = SEC_CHAN_BDC;
- } else if (p->flags & DCERPC_SCHANNEL_WORKSTATION) {
- chan_type = SEC_CHAN_WKSTA;
- } else if (p->flags & DCERPC_SCHANNEL_DOMAIN) {
- chan_type = SEC_CHAN_DOMAIN;
- }
-
- status = dcerpc_schannel_key(p, domain,
- username,
- password,
- chan_type,
- p->security_state.generic_state->user.schan_session_key);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Failed to fetch schannel session key: %s\n", nt_errstr(status)));
- gensec_end(&p->security_state.generic_state);
- return status;
- }
-
- status = gensec_set_username(p->security_state.generic_state, username);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Failed to set schannel username to %s: %s\n", username, nt_errstr(status)));
- gensec_end(&p->security_state.generic_state);
- return status;
- }
-
- status = gensec_set_domain(p->security_state.generic_state, domain);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Failed to set schannel domain to %s: %s\n", domain, nt_errstr(status)));
- gensec_end(&p->security_state.generic_state);
- return status;
- }
-
- status = gensec_start_mech_by_authtype(p->security_state.generic_state, DCERPC_AUTH_TYPE_SCHANNEL);
-
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Failed to start SCHANNEL GENSEC backend: %s\n", nt_errstr(status)));
- gensec_end(&p->security_state.generic_state);
- return status;
- }
- status = dcerpc_bind_auth3(p, DCERPC_AUTH_TYPE_SCHANNEL,
- uuid, version);
+ /* Fills in NETLOGON credentials */
+ status = dcerpc_schannel_key(tmp_ctx,
+ p, credentials);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("Failed to bind to pipe with SCHANNEL: %s\n", nt_errstr(status)));
- gensec_end(&p->security_state.generic_state);
+ DEBUG(1, ("Failed to setup credentials for account %s: %s\n",
+ cli_credentials_get_username(credentials),
+ nt_errstr(status)));
return status;
}
- return NT_STATUS_OK;
+ return dcerpc_bind_auth(p, table, credentials, DCERPC_AUTH_TYPE_SCHANNEL,
+ NULL);
}
-
-static const struct gensec_security_ops gensec_dcerpc_schannel_security_ops = {
- .name = "dcerpc_schannel",
- .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
- .client_start = dcerpc_schannel_client_start,
- .server_start = dcerpc_schannel_server_start,
- .update = dcerpc_schannel_update,
- .seal_packet = dcerpc_schannel_seal_packet,
- .sign_packet = dcerpc_schannel_sign_packet,
- .check_packet = dcerpc_schannel_check_packet,
- .unseal_packet = dcerpc_schannel_unseal_packet,
- .session_key = dcerpc_schannel_session_key,
- .session_info = dcerpc_schannel_session_info,
- .end = dcerpc_schannel_end
-};
-
-NTSTATUS gensec_dcerpc_schannel_init(void)
-{
- NTSTATUS ret;
- ret = register_backend("gensec", &gensec_dcerpc_schannel_security_ops);
- if (!NT_STATUS_IS_OK(ret)) {
- DEBUG(0,("Failed to register '%s' gensec backend!\n",
- gensec_dcerpc_schannel_security_ops.name));
- return ret;
- }
-
- return ret;
-}
git.samba.org / abartlet / samba.git / .git / blobdiff