+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
-
- Connect GENSEC to an external SASL lib
-
- Copyright (C) Andrew Bartlett <abartlet@samba.org> 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 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/tsocket/tsocket.h"
-#include "auth/credentials/credentials.h"
-#include "auth/gensec/gensec.h"
-#include "auth/gensec/gensec_internal.h"
-#include "auth/gensec/gensec_proto.h"
-#include "auth/gensec/gensec_toplevel_proto.h"
-#include <sasl/sasl.h>
-
-NTSTATUS gensec_sasl_init(void);
-
-struct gensec_sasl_state {
- sasl_conn_t *conn;
- int step;
- bool wrap;
-};
-
-static NTSTATUS sasl_nt_status(int sasl_ret)
-{
- switch (sasl_ret) {
- case SASL_CONTINUE:
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
- case SASL_NOMEM:
- return NT_STATUS_NO_MEMORY;
- case SASL_BADPARAM:
- case SASL_NOMECH:
- return NT_STATUS_INVALID_PARAMETER;
- case SASL_BADMAC:
- return NT_STATUS_ACCESS_DENIED;
- case SASL_OK:
- return NT_STATUS_OK;
- default:
- return NT_STATUS_UNSUCCESSFUL;
- }
-}
-
-static int gensec_sasl_get_user(void *context, int id,
- const char **result, unsigned *len)
-{
- struct gensec_security *gensec_security = talloc_get_type(context, struct gensec_security);
- const char *username = cli_credentials_get_username(gensec_get_credentials(gensec_security));
- if (id != SASL_CB_USER && id != SASL_CB_AUTHNAME) {
- return SASL_FAIL;
- }
-
- *result = username;
- return SASL_OK;
-}
-
-static int gensec_sasl_get_realm(void *context, int id,
- const char **availrealms,
- const char **result)
-{
- struct gensec_security *gensec_security = talloc_get_type(context, struct gensec_security);
- const char *realm = cli_credentials_get_realm(gensec_get_credentials(gensec_security));
- int i;
- if (id != SASL_CB_GETREALM) {
- return SASL_FAIL;
- }
-
- for (i=0; availrealms && availrealms[i]; i++) {
- if (strcasecmp_m(realm, availrealms[i]) == 0) {
- result[i] = availrealms[i];
- return SASL_OK;
- }
- }
- /* None of the realms match, so lets not specify one */
- *result = "";
- return SASL_OK;
-}
-
-static int gensec_sasl_get_password(sasl_conn_t *conn, void *context, int id,
- sasl_secret_t **psecret)
-{
- struct gensec_security *gensec_security = talloc_get_type(context, struct gensec_security);
- const char *password = cli_credentials_get_password(gensec_get_credentials(gensec_security));
-
- sasl_secret_t *secret;
- if (!password) {
- *psecret = NULL;
- return SASL_OK;
- }
- secret = talloc_size(gensec_security, sizeof(sasl_secret_t)+strlen(password)+1);
- if (!secret) {
- return SASL_NOMEM;
- }
- secret->len = strlen(password);
- strlcpy((char*)secret->data, password, secret->len+1);
- *psecret = secret;
- return SASL_OK;
-}
-
-static int gensec_sasl_dispose(struct gensec_sasl_state *gensec_sasl_state)
-{
- sasl_dispose(&gensec_sasl_state->conn);
- return SASL_OK;
-}
-
-typedef int (*__gensec_sasl_callback_t)(void);
-
-static NTSTATUS gensec_sasl_client_start(struct gensec_security *gensec_security)
-{
- struct gensec_sasl_state *gensec_sasl_state;
- const char *service = gensec_get_target_service(gensec_security);
- const char *target_name = gensec_get_target_hostname(gensec_security);
- const struct tsocket_address *tlocal_addr = gensec_get_local_address(gensec_security);
- const struct tsocket_address *tremote_addr = gensec_get_remote_address(gensec_security);
- char *local_addr = NULL;
- char *remote_addr = NULL;
- int sasl_ret;
-
- sasl_callback_t *callbacks;
-
- gensec_sasl_state = talloc_zero(gensec_security, struct gensec_sasl_state);
- if (!gensec_sasl_state) {
- return NT_STATUS_NO_MEMORY;
- }
-
- callbacks = talloc_array(gensec_sasl_state, sasl_callback_t, 5);
- callbacks[0].id = SASL_CB_USER;
- callbacks[0].proc = (__gensec_sasl_callback_t)gensec_sasl_get_user;
- callbacks[0].context = gensec_security;
-
- callbacks[1].id = SASL_CB_AUTHNAME;
- callbacks[1].proc = (__gensec_sasl_callback_t)gensec_sasl_get_user;
- callbacks[1].context = gensec_security;
-
- callbacks[2].id = SASL_CB_GETREALM;
- callbacks[2].proc = (__gensec_sasl_callback_t)gensec_sasl_get_realm;
- callbacks[2].context = gensec_security;
-
- callbacks[3].id = SASL_CB_PASS;
- callbacks[3].proc = (__gensec_sasl_callback_t)gensec_sasl_get_password;
- callbacks[3].context = gensec_security;
-
- callbacks[4].id = SASL_CB_LIST_END;
- callbacks[4].proc = NULL;
- callbacks[4].context = NULL;
-
- gensec_security->private_data = gensec_sasl_state;
-
- if (tlocal_addr) {
- local_addr = talloc_asprintf(gensec_sasl_state,
- "%s;%d",
- tsocket_address_inet_addr_string(tlocal_addr, gensec_sasl_state),
- tsocket_address_inet_port(tlocal_addr));
- }
-
- if (tremote_addr) {
- remote_addr = talloc_asprintf(gensec_sasl_state,
- "%s;%d",
- tsocket_address_inet_addr_string(tremote_addr, gensec_sasl_state),
- tsocket_address_inet_port(tremote_addr));
- }
- gensec_sasl_state->step = 0;
-
- sasl_ret = sasl_client_new(service,
- target_name,
- local_addr, remote_addr, callbacks, 0,
- &gensec_sasl_state->conn);
-
- if (sasl_ret == SASL_OK) {
- sasl_security_properties_t props;
- talloc_set_destructor(gensec_sasl_state, gensec_sasl_dispose);
-
- ZERO_STRUCT(props);
- if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
- props.min_ssf = 1;
- props.max_ssf = 1;
- props.maxbufsize = 65536;
- gensec_sasl_state->wrap = true;
- }
- if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
- props.min_ssf = 40;
- props.max_ssf = UINT_MAX;
- props.maxbufsize = 65536;
- gensec_sasl_state->wrap = true;
- }
-
- sasl_ret = sasl_setprop(gensec_sasl_state->conn, SASL_SEC_PROPS, &props);
- }
- if (sasl_ret != SASL_OK) {
- DEBUG(1, ("GENSEC SASL: client_new failed: %s\n", sasl_errdetail(gensec_sasl_state->conn)));
- }
- return sasl_nt_status(sasl_ret);
-}
-
-static NTSTATUS gensec_sasl_update(struct gensec_security *gensec_security,
- TALLOC_CTX *out_mem_ctx,
- struct tevent_context *ev,
- const DATA_BLOB in, DATA_BLOB *out)
-{
- struct gensec_sasl_state *gensec_sasl_state = talloc_get_type(gensec_security->private_data,
- struct gensec_sasl_state);
- int sasl_ret;
- const char *out_data;
- unsigned int out_len;
-
- if (gensec_sasl_state->step == 0) {
- const char *mech;
- sasl_ret = sasl_client_start(gensec_sasl_state->conn, gensec_security->ops->sasl_name,
- NULL, &out_data, &out_len, &mech);
- } else {
- sasl_ret = sasl_client_step(gensec_sasl_state->conn,
- (char*)in.data, in.length, NULL,
- &out_data, &out_len);
- }
- if (sasl_ret == SASL_OK || sasl_ret == SASL_CONTINUE) {
- *out = data_blob_talloc(out_mem_ctx, out_data, out_len);
- } else {
- DEBUG(1, ("GENSEC SASL: step %d update failed: %s\n", gensec_sasl_state->step,
- sasl_errdetail(gensec_sasl_state->conn)));
- }
- gensec_sasl_state->step++;
- return sasl_nt_status(sasl_ret);
-}
-
-static NTSTATUS gensec_sasl_unwrap_packets(struct gensec_security *gensec_security,
- TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB *in,
- DATA_BLOB *out,
- size_t *len_processed)
-{
- struct gensec_sasl_state *gensec_sasl_state = talloc_get_type(gensec_security->private_data,
- struct gensec_sasl_state);
- const char *out_data;
- unsigned int out_len;
-
- int sasl_ret = sasl_decode(gensec_sasl_state->conn,
- (char*)in->data, in->length, &out_data,
- &out_len);
- if (sasl_ret == SASL_OK) {
- *out = data_blob_talloc(out_mem_ctx, out_data, out_len);
- *len_processed = in->length;
- } else {
- DEBUG(1, ("GENSEC SASL: unwrap failed: %s\n", sasl_errdetail(gensec_sasl_state->conn)));
- }
- return sasl_nt_status(sasl_ret);
-
-}
-
-static NTSTATUS gensec_sasl_wrap_packets(struct gensec_security *gensec_security,
- TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB *in,
- DATA_BLOB *out,
- size_t *len_processed)
-{
- struct gensec_sasl_state *gensec_sasl_state = talloc_get_type(gensec_security->private_data,
- struct gensec_sasl_state);
- const char *out_data;
- unsigned int out_len;
- unsigned len_permitted;
- int sasl_ret = sasl_getprop(gensec_sasl_state->conn, SASL_SSF,
- (const void**)&len_permitted);
- if (sasl_ret != SASL_OK) {
- return sasl_nt_status(sasl_ret);
- }
- len_permitted = MIN(len_permitted, in->length);
-
- sasl_ret = sasl_encode(gensec_sasl_state->conn,
- (char*)in->data, len_permitted, &out_data,
- &out_len);
- if (sasl_ret == SASL_OK) {
- *out = data_blob_talloc(out_mem_ctx, out_data, out_len);
- *len_processed = in->length;
- } else {
- DEBUG(1, ("GENSEC SASL: wrap failed: %s\n", sasl_errdetail(gensec_sasl_state->conn)));
- }
- return sasl_nt_status(sasl_ret);
-}
-
-/* Try to figure out what features we actually got on the connection */
-static bool gensec_sasl_have_feature(struct gensec_security *gensec_security,
- uint32_t feature)
-{
- struct gensec_sasl_state *gensec_sasl_state = talloc_get_type(gensec_security->private_data,
- struct gensec_sasl_state);
- sasl_ssf_t ssf;
- int sasl_ret;
-
- /* If we did not elect to wrap, then we have neither sign nor seal, no matter what the SSF claims */
- if (!gensec_sasl_state->wrap) {
- return false;
- }
-
- sasl_ret = sasl_getprop(gensec_sasl_state->conn, SASL_SSF,
- (const void**)&ssf);
- if (sasl_ret != SASL_OK) {
- return false;
- }
- if (feature & GENSEC_FEATURE_SIGN) {
- if (ssf == 0) {
- return false;
- }
- if (ssf >= 1) {
- return true;
- }
- }
- if (feature & GENSEC_FEATURE_SEAL) {
- if (ssf <= 1) {
- return false;
- }
- if (ssf > 1) {
- return true;
- }
- }
- return false;
-}
-
-/* This could in theory work with any SASL mech */
-static const struct gensec_security_ops gensec_sasl_security_ops = {
- .name = "sasl-DIGEST-MD5",
- .sasl_name = "DIGEST-MD5",
- .client_start = gensec_sasl_client_start,
- .update = gensec_sasl_update,
- .wrap_packets = gensec_sasl_wrap_packets,
- .unwrap_packets = gensec_sasl_unwrap_packets,
- .have_feature = gensec_sasl_have_feature,
- .enabled = true,
- .priority = GENSEC_SASL
-};
-
-static int gensec_sasl_log(void *context,
- int sasl_log_level,
- const char *message)
-{
- int dl;
- switch (sasl_log_level) {
- case SASL_LOG_NONE:
- dl = 0;
- break;
- case SASL_LOG_ERR:
- dl = 1;
- break;
- case SASL_LOG_FAIL:
- dl = 2;
- break;
- case SASL_LOG_WARN:
- dl = 3;
- break;
- case SASL_LOG_NOTE:
- dl = 5;
- break;
- case SASL_LOG_DEBUG:
- dl = 10;
- break;
- case SASL_LOG_TRACE:
- dl = 11;
- break;
-#if DEBUG_PASSWORD
- case SASL_LOG_PASS:
- dl = 100;
- break;
-#endif
- default:
- dl = 0;
- break;
- }
- DEBUG(dl, ("gensec_sasl: %s\n", message));
-
- return SASL_OK;
-}
-
-NTSTATUS gensec_sasl_init(void)
-{
- NTSTATUS ret;
- int sasl_ret;
-#if 0
- int i;
- const char **sasl_mechs;
-#endif
-
- static const sasl_callback_t callbacks[] = {
- {
- .id = SASL_CB_LOG,
- .proc = (__gensec_sasl_callback_t)gensec_sasl_log,
- .context = NULL,
- },
- {
- .id = SASL_CB_LIST_END,
- .proc = NULL,
- .context = NULL,
- }
- };
- sasl_ret = sasl_client_init(callbacks);
-
- if (sasl_ret == SASL_NOMECH) {
- /* Nothing to do here */
- return NT_STATUS_OK;
- }
-
- if (sasl_ret != SASL_OK) {
- return sasl_nt_status(sasl_ret);
- }
-
- /* For now, we just register DIGEST-MD5 */
-#if 1
- ret = gensec_register(&gensec_sasl_security_ops);
- if (!NT_STATUS_IS_OK(ret)) {
- DEBUG(0,("Failed to register '%s' gensec backend!\n",
- gensec_sasl_security_ops.name));
- return ret;
- }
-#else
- sasl_mechs = sasl_global_listmech();
- for (i = 0; sasl_mechs && sasl_mechs[i]; i++) {
- const struct gensec_security_ops *oldmech;
- struct gensec_security_ops *newmech;
- oldmech = gensec_security_by_sasl_name(NULL, sasl_mechs[i]);
- if (oldmech) {
- continue;
- }
- newmech = talloc(talloc_autofree_context(), struct gensec_security_ops);
- if (!newmech) {
- return NT_STATUS_NO_MEMORY;
- }
- *newmech = gensec_sasl_security_ops;
- newmech->sasl_name = talloc_strdup(newmech, sasl_mechs[i]);
- newmech->name = talloc_asprintf(newmech, "sasl-%s", sasl_mechs[i]);
- if (!newmech->sasl_name || !newmech->name) {
- return NT_STATUS_NO_MEMORY;
- }
-
- ret = gensec_register(newmech);
- if (!NT_STATUS_IS_OK(ret)) {
- DEBUG(0,("Failed to register '%s' gensec backend!\n",
- gensec_sasl_security_ops.name));
- return ret;
- }
- }
-#endif
- return NT_STATUS_OK;
-}
git.samba.org / amitay / samba.git / commitdiff