#include "lib/util/asn1.h"
#include "lib/util/base64.h"
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
#undef strcasecmp
_PUBLIC_ NTSTATUS gensec_spnego_init(TALLOC_CTX *ctx);
SPNEGO_DONE
};
+struct spnego_state;
+struct spnego_neg_ops;
+struct spnego_neg_state;
+
+struct spnego_neg_state {
+ const struct spnego_neg_ops *ops;
+ const struct gensec_security_ops_wrapper *all_sec;
+ size_t all_idx;
+ const char * const *mech_types;
+ size_t mech_idx;
+};
+
+struct spnego_neg_ops {
+ const char *name;
+ /*
+ * The start hook does the initial processing on the incoming paket and
+ * may starts the first possible subcontext. It indicates that
+ * gensec_update() is required on the subcontext by returning
+ * NT_STATUS_MORE_PROCESSING_REQUIRED and return something useful in
+ * 'in_next'. Note that 'in_mem_ctx' is just passed as a hint, the
+ * caller should treat 'in_next' as const and don't attempt to free the
+ * content. NT_STATUS_OK indicates the finish hook should be invoked
+ * directly withing the need of gensec_update() on the subcontext.
+ * Every other error indicates an error that's returned to the caller.
+ */
+ NTSTATUS (*start_fn)(struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next);
+ /*
+ * The step hook processes the result of a failed gensec_update() and
+ * can decide to ignore a failure and continue the negotiation by
+ * setting up the next possible subcontext. It indicates that
+ * gensec_update() is required on the subcontext by returning
+ * NT_STATUS_MORE_PROCESSING_REQUIRED and return something useful in
+ * 'in_next'. Note that 'in_mem_ctx' is just passed as a hint, the
+ * caller should treat 'in_next' as const and don't attempt to free the
+ * content. NT_STATUS_OK indicates the finish hook should be invoked
+ * directly withing the need of gensec_update() on the subcontext.
+ * Every other error indicates an error that's returned to the caller.
+ */
+ NTSTATUS (*step_fn)(struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS last_status,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next);
+ /*
+ * The finish hook processes the result of a successful gensec_update()
+ * (NT_STATUS_OK or NT_STATUS_MORE_PROCESSING_REQUIRED). It forms the
+ * response pdu that will be returned from the toplevel gensec_update()
+ * together with NT_STATUS_OK or NT_STATUS_MORE_PROCESSING_REQUIRED. It
+ * may also alter the state machine to prepare receiving the next pdu
+ * from the peer.
+ */
+ NTSTATUS (*finish_fn)(struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS sub_status,
+ const DATA_BLOB sub_out,
+ TALLOC_CTX *out_mem_ctx,
+ DATA_BLOB *out);
+};
+
struct spnego_state {
enum spnego_message_type expected_packet;
enum spnego_state_position state_position;
NTSTATUS out_status;
};
-static void gensec_spnego_update_sub_abort(struct spnego_state *spnego_state)
+static struct spnego_neg_state *gensec_spnego_neg_state(TALLOC_CTX *mem_ctx,
+ const struct spnego_neg_ops *ops)
+{
+ struct spnego_neg_state *n = NULL;
+
+ n = talloc_zero(mem_ctx, struct spnego_neg_state);
+ if (n == NULL) {
+ return NULL;
+ }
+ n->ops = ops;
+
+ return n;
+}
+
+static void gensec_spnego_reset_sub_sec(struct spnego_state *spnego_state)
{
spnego_state->sub_sec_ready = false;
TALLOC_FREE(spnego_state->sub_sec_security);
static NTSTATUS gensec_spnego_server_try_fallback(struct gensec_security *gensec_security,
struct spnego_state *spnego_state,
- struct tevent_context *ev,
- TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB in, DATA_BLOB *out)
+ TALLOC_CTX *mem_ctx,
+ const DATA_BLOB in)
{
int i,j;
const struct gensec_security_ops **all_ops;
- all_ops = gensec_security_mechs(gensec_security, out_mem_ctx);
+ all_ops = gensec_security_mechs(gensec_security, mem_ctx);
for (i=0; all_ops && all_ops[i]; i++) {
bool is_spnego;
NTSTATUS nt_status;
- if (gensec_security != NULL &&
- !gensec_security_ops_enabled(all_ops[i], gensec_security))
- continue;
+ if (gensec_security != NULL &&
+ !gensec_security_ops_enabled(all_ops[i], gensec_security))
+ {
+ continue;
+ }
if (!all_ops[i]->oid) {
continue;
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
- nt_status = gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx, ev, in, out);
- return nt_status;
+
+ return NT_STATUS_OK;
}
DEBUG(1, ("Failed to parse SPNEGO request\n"));
return NT_STATUS_INVALID_PARAMETER;
}
-/*
- Parse the netTokenInit, either from the client, to the server, or
- from the server to the client.
-*/
-
-static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
- struct spnego_state *spnego_state,
- TALLOC_CTX *out_mem_ctx,
- struct tevent_context *ev,
- const char * const *mechType,
- const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
+static NTSTATUS gensec_spnego_create_negTokenInit_start(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
{
- int i;
- NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
- bool ok;
-
- const struct gensec_security_ops_wrapper *all_sec
- = gensec_security_by_oid_list(gensec_security,
- out_mem_ctx,
- mechType,
- GENSEC_OID_SPNEGO);
+ n->mech_idx = 0;
+ n->mech_types = gensec_security_oids(gensec_security, n,
+ GENSEC_OID_SPNEGO);
+ if (n->mech_types == NULL) {
+ DBG_WARNING("gensec_security_oids() failed\n");
+ return NT_STATUS_NO_MEMORY;
+ }
- ok = spnego_write_mech_types(spnego_state,
- mechType,
- &spnego_state->mech_types);
- if (!ok) {
- DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
+ n->all_idx = 0;
+ n->all_sec = gensec_security_by_oid_list(gensec_security,
+ n, n->mech_types,
+ GENSEC_OID_SPNEGO);
+ if (n->all_sec == NULL) {
+ DBG_WARNING("gensec_security_by_oid_list() failed\n");
return NT_STATUS_NO_MEMORY;
}
- if (spnego_state->state_position == SPNEGO_SERVER_START) {
- uint32_t j;
- for (j=0; mechType && mechType[j]; j++) {
- for (i=0; all_sec && all_sec[i].op; i++) {
- if (strcmp(mechType[j], all_sec[i].oid) != 0) {
- continue;
- }
-
- nt_status = gensec_subcontext_start(spnego_state,
- gensec_security,
- &spnego_state->sub_sec_security);
- if (!NT_STATUS_IS_OK(nt_status)) {
- return nt_status;
- }
- /* select the sub context */
- nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
- all_sec[i].op);
- if (!NT_STATUS_IS_OK(nt_status)) {
- /*
- * Pretend we never started it
- */
- gensec_spnego_update_sub_abort(spnego_state);
- break;
- }
-
- if (j > 0) {
- /* no optimistic token */
- spnego_state->neg_oid = all_sec[i].oid;
- *unwrapped_out = data_blob_null;
- nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
- /*
- * Indicate the downgrade and request a
- * mic.
- */
- spnego_state->downgraded = true;
- spnego_state->mic_requested = true;
- break;
- }
-
- nt_status = gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx,
- ev,
- unwrapped_in,
- unwrapped_out);
- if (NT_STATUS_IS_OK(nt_status)) {
- spnego_state->sub_sec_ready = true;
- }
- if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
- NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
-
- DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse contents: %s\n",
- spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
-
- /*
- * Pretend we never started it
- */
- gensec_spnego_update_sub_abort(spnego_state);
- break;
- }
-
- spnego_state->neg_oid = all_sec[i].oid;
- break;
- }
- if (spnego_state->sub_sec_security) {
- break;
- }
+ return n->ops->step_fn(gensec_security, spnego_state, n,
+ spnego_in, NT_STATUS_OK, in_mem_ctx, in_next);
+}
+
+static NTSTATUS gensec_spnego_create_negTokenInit_step(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS last_status,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ if (!NT_STATUS_IS_OK(last_status)) {
+ const struct gensec_security_ops_wrapper *cur_sec =
+ &n->all_sec[n->all_idx];
+ const struct gensec_security_ops_wrapper *next_sec = NULL;
+ const char *next = NULL;
+ const char *principal = NULL;
+ int dbg_level = DBGLVL_WARNING;
+ NTSTATUS status = last_status;
+
+ if (cur_sec[1].op != NULL) {
+ next_sec = &cur_sec[1];
+ }
+
+ if (next_sec != NULL) {
+ next = next_sec->op->name;
+ dbg_level = DBGLVL_NOTICE;
+ }
+
+ if (gensec_security->target.principal != NULL) {
+ principal = gensec_security->target.principal;
+ } else if (gensec_security->target.service != NULL &&
+ gensec_security->target.hostname != NULL)
+ {
+ principal = talloc_asprintf(spnego_state->sub_sec_security,
+ "%s/%s",
+ gensec_security->target.service,
+ gensec_security->target.hostname);
+ } else {
+ principal = gensec_security->target.hostname;
}
- if (!spnego_state->sub_sec_security) {
- DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
- return NT_STATUS_INVALID_PARAMETER;
+ DBG_PREFIX(dbg_level, (
+ "%s: creating NEG_TOKEN_INIT for %s failed "
+ "(next[%s]): %s\n", cur_sec->op->name,
+ principal, next, nt_errstr(status)));
+
+ if (next == NULL) {
+ /*
+ * A hard error without a possible fallback.
+ */
+ return status;
}
- }
- /* Having tried any optimistic token from the client (if we
- * were the server), if we didn't get anywhere, walk our list
- * in our preference order */
+ /*
+ * Pretend we never started it
+ */
+ gensec_spnego_reset_sub_sec(spnego_state);
- if (!spnego_state->sub_sec_security) {
- for (i=0; all_sec && all_sec[i].op; i++) {
- nt_status = gensec_subcontext_start(spnego_state,
- gensec_security,
- &spnego_state->sub_sec_security);
- if (!NT_STATUS_IS_OK(nt_status)) {
- return nt_status;
- }
- /* select the sub context */
- nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
- all_sec[i].op);
- if (!NT_STATUS_IS_OK(nt_status)) {
- /*
- * Pretend we never started it.
- */
- gensec_spnego_update_sub_abort(spnego_state);
- continue;
- }
+ /*
+ * And try the next one...
+ */
+ n->all_idx += 1;
+ }
- spnego_state->neg_oid = all_sec[i].oid;
+ for (; n->all_sec[n->all_idx].op != NULL; n->all_idx++) {
+ const struct gensec_security_ops_wrapper *cur_sec =
+ &n->all_sec[n->all_idx];
+ NTSTATUS status;
- /* only get the helping start blob for the first OID */
- nt_status = gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx,
- ev,
- data_blob_null,
- unwrapped_out);
- if (NT_STATUS_IS_OK(nt_status)) {
- spnego_state->sub_sec_ready = true;
- }
+ status = gensec_subcontext_start(spnego_state,
+ gensec_security,
+ &spnego_state->sub_sec_security);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
- /* it is likely that a NULL input token will
- * not be liked by most server mechs, but if
- * we are in the client, we want the first
- * update packet to be able to abort the use
- * of this mech */
- if (spnego_state->state_position != SPNEGO_SERVER_START) {
- if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
- NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_LOGON_SERVERS) ||
- NT_STATUS_EQUAL(nt_status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
- NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
- const char *next = NULL;
- const char *principal = NULL;
- int dbg_level = DBGLVL_WARNING;
-
- if (all_sec[i+1].op != NULL) {
- next = all_sec[i+1].op->name;
- dbg_level = DBGLVL_NOTICE;
- }
-
- if (gensec_security->target.principal != NULL) {
- principal = gensec_security->target.principal;
- } else if (gensec_security->target.service != NULL &&
- gensec_security->target.hostname != NULL)
- {
- principal = talloc_asprintf(spnego_state->sub_sec_security,
- "%s/%s",
- gensec_security->target.service,
- gensec_security->target.hostname);
- } else {
- principal = gensec_security->target.hostname;
- }
-
- DEBUG(dbg_level, ("SPNEGO(%s) creating NEG_TOKEN_INIT for %s failed (next[%s]): %s\n",
- spnego_state->sub_sec_security->ops->name,
- principal,
- next, nt_errstr(nt_status)));
-
- /*
- * Pretend we never started it.
- */
- gensec_spnego_update_sub_abort(spnego_state);
- continue;
- }
- }
+ /* select the sub context */
+ status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
+ cur_sec->op);
+ if (!NT_STATUS_IS_OK(status)) {
+ gensec_spnego_reset_sub_sec(spnego_state);
+ continue;
+ }
- break;
+ /* In the client, try and produce the first (optimistic) packet */
+ if (spnego_state->state_position == SPNEGO_CLIENT_START) {
+ *in_next = data_blob_null;
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
+
+ *in_next = data_blob_null;
+ return NT_STATUS_OK;
}
- if (spnego_state->sub_sec_security) {
- /* it is likely that a NULL input token will
- * not be liked by most server mechs, but this
- * does the right thing in the CIFS client.
- * just push us along the merry-go-round
- * again, and hope for better luck next
- * time */
+ DBG_WARNING("Failed to setup SPNEGO negTokenInit request\n");
+ return NT_STATUS_INVALID_PARAMETER;
+}
- if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
- *unwrapped_out = data_blob_null;
- nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
- }
+static NTSTATUS gensec_spnego_create_negTokenInit_finish(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS sub_status,
+ const DATA_BLOB sub_out,
+ TALLOC_CTX *out_mem_ctx,
+ DATA_BLOB *out)
+{
+ const struct gensec_security_ops_wrapper *cur_sec =
+ &n->all_sec[n->all_idx];
+ struct spnego_data spnego_out;
+ bool ok;
- if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
- && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
- && !NT_STATUS_IS_OK(nt_status)) {
- DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
- spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
+ spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
- /* We started the mech correctly, and the
- * input from the other side was valid.
- * Return the error (say bad password, invalid
- * ticket) */
- gensec_spnego_update_sub_abort(spnego_state);
- return nt_status;
- }
+ n->mech_types = gensec_security_oids_from_ops_wrapped(n, cur_sec);
+ if (n->mech_types == NULL) {
+ DBG_WARNING("gensec_security_oids_from_ops_wrapped() failed\n");
+ return NT_STATUS_NO_MEMORY;
+ }
- return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
+ ok = spnego_write_mech_types(spnego_state,
+ n->mech_types,
+ &spnego_state->mech_types);
+ if (!ok) {
+ DBG_ERR("Failed to write mechTypes\n");
+ return NT_STATUS_NO_MEMORY;
}
- DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
- /* we could re-negotiate here, but it would only work
- * if the client or server lied about what it could
- * support the first time. Lets keep this code to
- * reality */
+ /* List the remaining mechs as options */
+ spnego_out.negTokenInit.mechTypes = n->mech_types;
+ spnego_out.negTokenInit.reqFlags = data_blob_null;
+ spnego_out.negTokenInit.reqFlagsPadding = 0;
- return nt_status;
+ if (spnego_state->state_position == SPNEGO_SERVER_START) {
+ spnego_out.negTokenInit.mechListMIC
+ = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
+ } else {
+ spnego_out.negTokenInit.mechListMIC = data_blob_null;
+ }
+
+ spnego_out.negTokenInit.mechToken = sub_out;
+
+ if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+ DBG_ERR("Failed to write NEG_TOKEN_INIT\n");
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /*
+ * Note that 'cur_sec' is temporary memory, but
+ * cur_sec->oid points to a const string in the
+ * backends gensec_security_ops structure.
+ */
+ spnego_state->neg_oid = cur_sec->oid;
+
+ /* set next state */
+ if (spnego_state->state_position == SPNEGO_SERVER_START) {
+ spnego_state->state_position = SPNEGO_SERVER_START;
+ spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
+ } else {
+ spnego_state->state_position = SPNEGO_CLIENT_TARG;
+ spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+ }
+
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
-/** create a negTokenInit
- *
- * This is the same packet, no matter if the client or server sends it first, but it is always the first packet
-*/
-static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
- struct spnego_state *spnego_state,
- TALLOC_CTX *out_mem_ctx,
- struct tevent_context *ev,
- const DATA_BLOB in, DATA_BLOB *out)
-{
- int i;
- NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
- const char **mechTypes = NULL;
- DATA_BLOB unwrapped_out = data_blob_null;
- const struct gensec_security_ops_wrapper *all_sec;
+static const struct spnego_neg_ops gensec_spnego_create_negTokenInit_ops = {
+ .name = "create_negTokenInit",
+ .start_fn = gensec_spnego_create_negTokenInit_start,
+ .step_fn = gensec_spnego_create_negTokenInit_step,
+ .finish_fn = gensec_spnego_create_negTokenInit_finish,
+};
- mechTypes = gensec_security_oids(gensec_security,
- out_mem_ctx, GENSEC_OID_SPNEGO);
+static NTSTATUS gensec_spnego_client_negTokenInit_start(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ const char *tp = NULL;
- all_sec = gensec_security_by_oid_list(gensec_security,
- out_mem_ctx,
- mechTypes,
- GENSEC_OID_SPNEGO);
- for (i=0; all_sec && all_sec[i].op; i++) {
- struct spnego_data spnego_out;
- const char **send_mech_types;
- bool ok;
+ /* The server offers a list of mechanisms */
- nt_status = gensec_subcontext_start(spnego_state,
- gensec_security,
- &spnego_state->sub_sec_security);
- if (!NT_STATUS_IS_OK(nt_status)) {
- return nt_status;
- }
- /* select the sub context */
- nt_status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
- all_sec[i].op);
- if (!NT_STATUS_IS_OK(nt_status)) {
- gensec_spnego_update_sub_abort(spnego_state);
- continue;
+ tp = spnego_in->negTokenInit.targetPrincipal;
+ if (tp != NULL && strcmp(tp, ADS_IGNORE_PRINCIPAL) != 0) {
+ DBG_INFO("Server claims it's principal name is %s\n", tp);
+ if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
+ gensec_set_target_principal(gensec_security, tp);
}
+ }
- /* In the client, try and produce the first (optimistic) packet */
- if (spnego_state->state_position == SPNEGO_CLIENT_START) {
- nt_status = gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx,
- ev,
- data_blob_null,
- &unwrapped_out);
- if (NT_STATUS_IS_OK(nt_status)) {
- spnego_state->sub_sec_ready = true;
- }
+ n->mech_idx = 0;
+ n->mech_types = spnego_in->negTokenInit.mechTypes;
+ if (n->mech_types == NULL) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ n->all_idx = 0;
+ n->all_sec = gensec_security_by_oid_list(gensec_security,
+ n, n->mech_types,
+ GENSEC_OID_SPNEGO);
+ if (n->all_sec == NULL) {
+ DBG_WARNING("gensec_security_by_oid_list() failed\n");
+ return NT_STATUS_INVALID_PARAMETER;
+ }
- if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
- && !NT_STATUS_IS_OK(nt_status)) {
- const char *next = NULL;
- const char *principal = NULL;
- int dbg_level = DBGLVL_WARNING;
-
- if (all_sec[i+1].op != NULL) {
- next = all_sec[i+1].op->name;
- dbg_level = DBGLVL_NOTICE;
- }
-
- if (gensec_security->target.principal != NULL) {
- principal = gensec_security->target.principal;
- } else if (gensec_security->target.service != NULL &&
- gensec_security->target.hostname != NULL)
- {
- principal = talloc_asprintf(spnego_state->sub_sec_security,
- "%s/%s",
- gensec_security->target.service,
- gensec_security->target.hostname);
- } else {
- principal = gensec_security->target.hostname;
- }
-
- DEBUG(dbg_level, ("SPNEGO(%s) creating NEG_TOKEN_INIT for %s failed (next[%s]): %s\n",
- spnego_state->sub_sec_security->ops->name,
- principal,
- next, nt_errstr(nt_status)));
+ return n->ops->step_fn(gensec_security, spnego_state, n,
+ spnego_in, NT_STATUS_OK, in_mem_ctx, in_next);
+}
- /*
- * Pretend we never started it
- */
- gensec_spnego_update_sub_abort(spnego_state);
- continue;
- }
+static NTSTATUS gensec_spnego_client_negTokenInit_step(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS last_status,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ if (!NT_STATUS_IS_OK(last_status)) {
+ const struct gensec_security_ops_wrapper *cur_sec =
+ &n->all_sec[n->all_idx];
+ const struct gensec_security_ops_wrapper *next_sec = NULL;
+ const char *next = NULL;
+ const char *principal = NULL;
+ int dbg_level = DBGLVL_WARNING;
+ bool allow_fallback = false;
+ NTSTATUS status = last_status;
+
+ if (cur_sec[1].op != NULL) {
+ next_sec = &cur_sec[1];
}
- spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
+ /*
+ * it is likely that a NULL input token will
+ * not be liked by most server mechs, but if
+ * we are in the client, we want the first
+ * update packet to be able to abort the use
+ * of this mech
+ */
+ if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER) ||
+ NT_STATUS_EQUAL(status, NT_STATUS_NO_LOGON_SERVERS) ||
+ NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC) ||
+ NT_STATUS_EQUAL(status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO))
+ {
+ allow_fallback = true;
+ }
+
+ if (allow_fallback && next_sec != NULL) {
+ next = next_sec->op->name;
+ dbg_level = DBGLVL_NOTICE;
+ }
+
+ if (gensec_security->target.principal != NULL) {
+ principal = gensec_security->target.principal;
+ } else if (gensec_security->target.service != NULL &&
+ gensec_security->target.hostname != NULL)
+ {
+ principal = talloc_asprintf(spnego_state->sub_sec_security,
+ "%s/%s",
+ gensec_security->target.service,
+ gensec_security->target.hostname);
+ } else {
+ principal = gensec_security->target.hostname;
+ }
- send_mech_types = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
- &all_sec[i]);
+ DBG_PREFIX(dbg_level, (
+ "%s: creating NEG_TOKEN_INIT for %s failed "
+ "(next[%s]): %s\n", cur_sec->op->name,
+ principal, next, nt_errstr(status)));
- ok = spnego_write_mech_types(spnego_state,
- send_mech_types,
- &spnego_state->mech_types);
- if (!ok) {
- DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
- return NT_STATUS_NO_MEMORY;
+ if (next == NULL) {
+ /*
+ * A hard error without a possible fallback.
+ */
+ return status;
}
- /* List the remaining mechs as options */
- spnego_out.negTokenInit.mechTypes = send_mech_types;
- spnego_out.negTokenInit.reqFlags = data_blob_null;
- spnego_out.negTokenInit.reqFlagsPadding = 0;
+ /*
+ * Pretend we never started it.
+ */
+ gensec_spnego_reset_sub_sec(spnego_state);
+
+ /*
+ * And try the next one...
+ */
+ n->all_idx += 1;
+ }
+
+ for (; n->all_sec[n->all_idx].op != NULL; n->all_idx++) {
+ const struct gensec_security_ops_wrapper *cur_sec =
+ &n->all_sec[n->all_idx];
+ NTSTATUS status;
- if (spnego_state->state_position == SPNEGO_SERVER_START) {
- spnego_out.negTokenInit.mechListMIC
- = data_blob_string_const(ADS_IGNORE_PRINCIPAL);
- } else {
- spnego_out.negTokenInit.mechListMIC = data_blob_null;
+ status = gensec_subcontext_start(spnego_state,
+ gensec_security,
+ &spnego_state->sub_sec_security);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
}
- spnego_out.negTokenInit.mechToken = unwrapped_out;
-
- if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
- DEBUG(1, ("Failed to write NEG_TOKEN_INIT\n"));
- return NT_STATUS_INVALID_PARAMETER;
+ /* select the sub context */
+ status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
+ cur_sec->op);
+ if (!NT_STATUS_IS_OK(status)) {
+ gensec_spnego_reset_sub_sec(spnego_state);
+ continue;
}
- /* set next state */
- spnego_state->neg_oid = all_sec[i].oid;
+ /*
+ * Note that 'cur_sec' is temporary memory, but
+ * cur_sec->oid points to a const string in the
+ * backends gensec_security_ops structure.
+ */
+ spnego_state->neg_oid = cur_sec->oid;
+ /*
+ * As client we don't use an optimistic token from the server.
+ * But try to produce one for the server.
+ */
+ *in_next = data_blob_null;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
- gensec_spnego_update_sub_abort(spnego_state);
- DEBUG(10, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
- return nt_status;
+ DBG_WARNING("Could not find a suitable mechtype in NEG_TOKEN_INIT\n");
+ return NT_STATUS_INVALID_PARAMETER;
}
-
-/** create a server negTokenTarg
- *
- * This is the case, where the client is the first one who sends data
-*/
-
-static NTSTATUS gensec_spnego_server_negTokenTarg(struct spnego_state *spnego_state,
- TALLOC_CTX *out_mem_ctx,
- NTSTATUS nt_status,
- const DATA_BLOB unwrapped_out,
- DATA_BLOB mech_list_mic,
- DATA_BLOB *out)
+static NTSTATUS gensec_spnego_client_negTokenInit_finish(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS sub_status,
+ const DATA_BLOB sub_out,
+ TALLOC_CTX *out_mem_ctx,
+ DATA_BLOB *out)
{
struct spnego_data spnego_out;
+ const char *my_mechs[] = {NULL, NULL};
+ bool ok;
+ my_mechs[0] = spnego_state->neg_oid;
/* compose reply */
- spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
- spnego_out.negTokenTarg.responseToken = unwrapped_out;
- spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
- spnego_out.negTokenTarg.supportedMech = NULL;
-
- if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
- spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
- if (spnego_state->mic_requested) {
- spnego_out.negTokenTarg.negResult = SPNEGO_REQUEST_MIC;
- spnego_state->mic_requested = false;
- } else {
- spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
- }
- spnego_state->state_position = SPNEGO_SERVER_TARG;
- } else if (NT_STATUS_IS_OK(nt_status)) {
- if (unwrapped_out.data) {
- spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
- }
- spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
- spnego_state->state_position = SPNEGO_DONE;
- } else {
- spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
- spnego_out.negTokenTarg.mechListMIC = data_blob_null;
- DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
- spnego_state->state_position = SPNEGO_DONE;
- }
+ spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
+ spnego_out.negTokenInit.mechTypes = my_mechs;
+ spnego_out.negTokenInit.reqFlags = data_blob_null;
+ spnego_out.negTokenInit.reqFlagsPadding = 0;
+ spnego_out.negTokenInit.mechListMIC = data_blob_null;
+ spnego_out.negTokenInit.mechToken = sub_out;
if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
- DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
+ DBG_ERR("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n");
return NT_STATUS_INVALID_PARAMETER;
}
+ ok = spnego_write_mech_types(spnego_state,
+ my_mechs,
+ &spnego_state->mech_types);
+ if (!ok) {
+ DBG_ERR("failed to write mechTypes\n");
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* set next state */
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
- spnego_state->num_targs++;
+ spnego_state->state_position = SPNEGO_CLIENT_TARG;
- return nt_status;
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
+static const struct spnego_neg_ops gensec_spnego_client_negTokenInit_ops = {
+ .name = "client_negTokenInit",
+ .start_fn = gensec_spnego_client_negTokenInit_start,
+ .step_fn = gensec_spnego_client_negTokenInit_step,
+ .finish_fn = gensec_spnego_client_negTokenInit_finish,
+};
-static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
- struct tevent_context *ev,
- const DATA_BLOB in, DATA_BLOB *out)
+static NTSTATUS gensec_spnego_client_negTokenTarg_start(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
{
- struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
- DATA_BLOB mech_list_mic = data_blob_null;
- DATA_BLOB unwrapped_out = data_blob_null;
- struct spnego_data spnego_out;
- struct spnego_data spnego;
- ssize_t len;
+ struct spnego_negTokenTarg *ta = &spnego_in->negTokenTarg;
+ NTSTATUS status;
- *out = data_blob_null;
+ spnego_state->num_targs++;
- /* and switch into the state machine */
+ if (ta->negResult == SPNEGO_REJECT) {
+ return NT_STATUS_LOGON_FAILURE;
+ }
- switch (spnego_state->state_position) {
- case SPNEGO_FALLBACK:
- return gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx, ev, in, out);
- case SPNEGO_SERVER_START:
- {
- NTSTATUS nt_status;
- if (in.length) {
+ if (ta->negResult == SPNEGO_REQUEST_MIC) {
+ spnego_state->mic_requested = true;
+ }
- len = spnego_read_data(gensec_security, in, &spnego);
- if (len == -1) {
- return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
- ev, out_mem_ctx, in, out);
- }
- /* client sent NegTargetInit, we send NegTokenTarg */
-
- /* OK, so it's real SPNEGO, check the packet's the one we expect */
- if (spnego.type != spnego_state->expected_packet) {
- DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
- spnego_state->expected_packet));
- dump_data(1, in.data, in.length);
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
- }
+ if (ta->mechListMIC.length > 0) {
+ DATA_BLOB *m = &ta->mechListMIC;
+ const DATA_BLOB *r = &ta->responseToken;
- nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
- spnego_state,
- out_mem_ctx,
- ev,
- spnego.negTokenInit.mechTypes,
- spnego.negTokenInit.mechToken,
- &unwrapped_out);
+ /*
+ * Windows 2000 has a bug, it repeats the
+ * responseToken in the mechListMIC field.
+ */
+ if (m->length == r->length) {
+ int cmp;
- if (spnego_state->simulate_w2k) {
- /*
- * Windows 2000 returns the unwrapped token
- * also in the mech_list_mic field.
- *
- * In order to verify our client code,
- * we need a way to have a server with this
- * broken behaviour
- */
- mech_list_mic = unwrapped_out;
+ cmp = memcmp(m->data, r->data, m->length);
+ if (cmp == 0) {
+ data_blob_free(m);
}
-
- nt_status = gensec_spnego_server_negTokenTarg(spnego_state,
- out_mem_ctx,
- nt_status,
- unwrapped_out,
- mech_list_mic,
- out);
-
- spnego_free_data(&spnego);
-
- return nt_status;
- } else {
- nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
- out_mem_ctx, ev, in, out);
- spnego_state->state_position = SPNEGO_SERVER_START;
- spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
- return nt_status;
}
}
- case SPNEGO_CLIENT_START:
+ /* Server didn't like our choice of mech, and chose something else */
+ if (((ta->negResult == SPNEGO_ACCEPT_INCOMPLETE) ||
+ (ta->negResult == SPNEGO_REQUEST_MIC)) &&
+ ta->supportedMech != NULL &&
+ strcmp(ta->supportedMech, spnego_state->neg_oid) != 0)
{
- /* The server offers a list of mechanisms */
-
- const char *my_mechs[] = {NULL, NULL};
- NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
- bool ok;
+ const char *client_mech = NULL;
+ const char *client_oid = NULL;
+ const char *server_mech = NULL;
+ const char *server_oid = NULL;
- if (!in.length) {
- /* client to produce negTokenInit */
- nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
- out_mem_ctx, ev, in, out);
- spnego_state->state_position = SPNEGO_CLIENT_TARG;
- spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
- return nt_status;
- }
+ client_mech = gensec_get_name_by_oid(gensec_security,
+ spnego_state->neg_oid);
+ client_oid = spnego_state->neg_oid;
+ server_mech = gensec_get_name_by_oid(gensec_security,
+ ta->supportedMech);
+ server_oid = ta->supportedMech;
- len = spnego_read_data(gensec_security, in, &spnego);
+ DBG_NOTICE("client preferred mech (%s[%s]) not accepted, "
+ "server wants: %s[%s]\n",
+ client_mech, client_oid, server_mech, server_oid);
- if (len == -1) {
- DEBUG(1, ("Invalid SPNEGO request:\n"));
- dump_data(1, in.data, in.length);
- return NT_STATUS_INVALID_PARAMETER;
- }
+ spnego_state->downgraded = true;
+ gensec_spnego_reset_sub_sec(spnego_state);
- /* OK, so it's real SPNEGO, check the packet's the one we expect */
- if (spnego.type != spnego_state->expected_packet) {
- DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
- spnego_state->expected_packet));
- dump_data(1, in.data, in.length);
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
+ status = gensec_subcontext_start(spnego_state,
+ gensec_security,
+ &spnego_state->sub_sec_security);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
}
- if (spnego.negTokenInit.targetPrincipal
- && strcmp(spnego.negTokenInit.targetPrincipal, ADS_IGNORE_PRINCIPAL) != 0) {
- DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
- if (lpcfg_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
- gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
- }
+ /* select the sub context */
+ status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
+ ta->supportedMech);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
}
- nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
- spnego_state,
- out_mem_ctx,
- ev,
- spnego.negTokenInit.mechTypes,
- spnego.negTokenInit.mechToken,
- &unwrapped_out);
-
- if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
- spnego_free_data(&spnego);
- return nt_status;
+ spnego_state->neg_oid = talloc_strdup(spnego_state,
+ ta->supportedMech);
+ if (spnego_state->neg_oid == NULL) {
+ return NT_STATUS_NO_MEMORY;
}
+ }
- my_mechs[0] = spnego_state->neg_oid;
- /* compose reply */
- spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
- spnego_out.negTokenInit.mechTypes = my_mechs;
- spnego_out.negTokenInit.reqFlags = data_blob_null;
- spnego_out.negTokenInit.reqFlagsPadding = 0;
- spnego_out.negTokenInit.mechListMIC = data_blob_null;
- spnego_out.negTokenInit.mechToken = unwrapped_out;
-
- if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
- DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_INIT\n"));
- return NT_STATUS_INVALID_PARAMETER;
+ if (ta->mechListMIC.length > 0) {
+ if (spnego_state->sub_sec_ready) {
+ spnego_state->needs_mic_check = true;
}
+ }
- ok = spnego_write_mech_types(spnego_state,
- my_mechs,
- &spnego_state->mech_types);
- if (!ok) {
- DEBUG(1, ("SPNEGO: Failed to write mechTypes\n"));
- return NT_STATUS_NO_MEMORY;
+ if (spnego_state->needs_mic_check) {
+ if (ta->responseToken.length != 0) {
+ DBG_WARNING("non empty response token not expected\n");
+ return NT_STATUS_INVALID_PARAMETER;
}
- /* set next state */
- spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
- spnego_state->state_position = SPNEGO_CLIENT_TARG;
+ if (ta->mechListMIC.length == 0
+ && spnego_state->may_skip_mic_check) {
+ /*
+ * In this case we don't require
+ * a mechListMIC from the server.
+ *
+ * This works around bugs in the Azure
+ * and Apple spnego implementations.
+ *
+ * See
+ * https://bugzilla.samba.org/show_bug.cgi?id=11994
+ */
+ spnego_state->needs_mic_check = false;
+ return NT_STATUS_OK;
+ }
+
+ status = gensec_check_packet(spnego_state->sub_sec_security,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ &ta->mechListMIC);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("failed to verify mechListMIC: %s\n",
+ nt_errstr(status));
+ return status;
+ }
+ spnego_state->needs_mic_check = false;
+ spnego_state->done_mic_check = true;
+ return NT_STATUS_OK;
+ }
- spnego_free_data(&spnego);
+ if (!spnego_state->sub_sec_ready) {
+ *in_next = ta->responseToken;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
- case SPNEGO_SERVER_TARG:
- {
- NTSTATUS nt_status;
- bool have_sign = true;
- bool new_spnego = false;
- if (!in.length) {
- return NT_STATUS_INVALID_PARAMETER;
- }
+ return NT_STATUS_OK;
+}
- len = spnego_read_data(gensec_security, in, &spnego);
+static NTSTATUS gensec_spnego_client_negTokenTarg_step(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS last_status,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ if (GENSEC_UPDATE_IS_NTERROR(last_status)) {
+ DBG_WARNING("SPNEGO(%s) login failed: %s\n",
+ spnego_state->sub_sec_security->ops->name,
+ nt_errstr(last_status));
+ return last_status;
+ }
- if (len == -1) {
- DEBUG(1, ("Invalid SPNEGO request:\n"));
- dump_data(1, in.data, in.length);
- return NT_STATUS_INVALID_PARAMETER;
- }
+ /*
+ * This should never be reached!
+ * The step function is only called on errors!
+ */
+ smb_panic(__location__);
+ return NT_STATUS_INTERNAL_ERROR;
+}
- /* OK, so it's real SPNEGO, check the packet's the one we expect */
- if (spnego.type != spnego_state->expected_packet) {
- DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
- spnego_state->expected_packet));
- dump_data(1, in.data, in.length);
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
- }
+static NTSTATUS gensec_spnego_client_negTokenTarg_finish(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS sub_status,
+ const DATA_BLOB sub_out,
+ TALLOC_CTX *out_mem_ctx,
+ DATA_BLOB *out)
+{
+ const struct spnego_negTokenTarg *ta =
+ &spnego_in->negTokenTarg;
+ DATA_BLOB mech_list_mic = data_blob_null;
+ NTSTATUS status;
+ struct spnego_data spnego_out;
- spnego_state->num_targs++;
+ status = sub_status;
- if (!spnego_state->sub_sec_security) {
- DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
- }
+ if (!spnego_state->sub_sec_ready) {
+ /*
+ * We're not yet ready to deal with signatures.
+ */
+ goto client_response;
+ }
- if (spnego_state->needs_mic_check) {
- if (spnego.negTokenTarg.responseToken.length != 0) {
- DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
- }
+ if (spnego_state->done_mic_check) {
+ /*
+ * We already checked the mic,
+ * either the in last round here
+ * in gensec_spnego_client_negTokenTarg_finish()
+ * or during this round in
+ * gensec_spnego_client_negTokenTarg_start().
+ *
+ * Both cases we're sure we don't have to
+ * call gensec_sign_packet().
+ */
+ goto client_response;
+ }
- nt_status = gensec_check_packet(spnego_state->sub_sec_security,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- &spnego.negTokenTarg.mechListMIC);
- if (NT_STATUS_IS_OK(nt_status)) {
- spnego_state->needs_mic_check = false;
- spnego_state->done_mic_check = true;
- } else {
- DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
- nt_errstr(nt_status)));
- }
- goto server_response;
- }
+ if (spnego_state->may_skip_mic_check) {
+ /*
+ * This can only be set during
+ * the last round here in
+ * gensec_spnego_client_negTokenTarg_finish()
+ * below. And during this round
+ * we already passed the checks in
+ * gensec_spnego_client_negTokenTarg_start().
+ *
+ * So we need to skip to deal with
+ * any signatures now.
+ */
+ goto client_response;
+ }
- nt_status = gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx, ev,
- spnego.negTokenTarg.responseToken,
- &unwrapped_out);
- if (NT_STATUS_IS_OK(nt_status)) {
- spnego_state->sub_sec_ready = true;
- }
- if (!NT_STATUS_IS_OK(nt_status)) {
- goto server_response;
- }
+ if (!spnego_state->done_mic_check) {
+ bool have_sign = true;
+ bool new_spnego = false;
have_sign = gensec_have_feature(spnego_state->sub_sec_security,
GENSEC_FEATURE_SIGN);
}
new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
GENSEC_FEATURE_NEW_SPNEGO);
- if (spnego.negTokenTarg.mechListMIC.length > 0) {
- new_spnego = true;
- }
- if (have_sign && new_spnego) {
- spnego_state->needs_mic_check = true;
- spnego_state->needs_mic_sign = true;
- }
+ switch (ta->negResult) {
+ case SPNEGO_ACCEPT_COMPLETED:
+ case SPNEGO_NONE_RESULT:
+ if (spnego_state->num_targs == 1) {
+ /*
+ * the first exchange doesn't require
+ * verification
+ */
+ new_spnego = false;
+ }
+
+ break;
- if (have_sign && spnego.negTokenTarg.mechListMIC.length > 0) {
- nt_status = gensec_check_packet(spnego_state->sub_sec_security,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- &spnego.negTokenTarg.mechListMIC);
- if (!NT_STATUS_IS_OK(nt_status)) {
- DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
- nt_errstr(nt_status)));
- goto server_response;
+ case SPNEGO_ACCEPT_INCOMPLETE:
+ if (ta->mechListMIC.length > 0) {
+ new_spnego = true;
+ break;
}
- spnego_state->needs_mic_check = false;
- spnego_state->done_mic_check = true;
- }
-
- if (spnego_state->needs_mic_sign) {
- nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
- out_mem_ctx,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- &mech_list_mic);
- if (!NT_STATUS_IS_OK(nt_status)) {
- DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
- nt_errstr(nt_status)));
- goto server_response;
+ if (spnego_state->downgraded) {
+ /*
+ * A downgrade should be protected if
+ * supported
+ */
+ break;
+ }
+
+ /*
+ * The caller may just asked for
+ * GENSEC_FEATURE_SESSION_KEY, this
+ * is only reflected in the want_features.
+ *
+ * As it will imply
+ * gensec_have_features(GENSEC_FEATURE_SIGN)
+ * to return true.
+ */
+ if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+ break;
+ }
+ if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+ break;
+ }
+ /*
+ * Here we're sure our preferred mech was
+ * selected by the server and our caller doesn't
+ * need GENSEC_FEATURE_SIGN nor
+ * GENSEC_FEATURE_SEAL support.
+ *
+ * In this case we don't require
+ * a mechListMIC from the server.
+ *
+ * This works around bugs in the Azure
+ * and Apple spnego implementations.
+ *
+ * See
+ * https://bugzilla.samba.org/show_bug.cgi?id=11994
+ */
+ spnego_state->may_skip_mic_check = true;
+ break;
+
+ case SPNEGO_REQUEST_MIC:
+ if (ta->mechListMIC.length > 0) {
+ new_spnego = true;
}
- spnego_state->needs_mic_sign = false;
+ break;
+ default:
+ break;
}
- if (spnego_state->needs_mic_check) {
- nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+ if (spnego_state->mic_requested) {
+ if (have_sign) {
+ new_spnego = true;
+ }
}
- server_response:
- nt_status = gensec_spnego_server_negTokenTarg(spnego_state,
- out_mem_ctx,
- nt_status,
- unwrapped_out,
- mech_list_mic,
- out);
+ if (have_sign && new_spnego) {
+ spnego_state->needs_mic_check = true;
+ spnego_state->needs_mic_sign = true;
+ }
+ }
- spnego_free_data(&spnego);
+ if (ta->mechListMIC.length > 0) {
+ status = gensec_check_packet(spnego_state->sub_sec_security,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ &ta->mechListMIC);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("failed to verify mechListMIC: %s\n",
+ nt_errstr(status));
+ return status;
+ }
+ spnego_state->needs_mic_check = false;
+ spnego_state->done_mic_check = true;
+ }
- return nt_status;
+ if (spnego_state->needs_mic_sign) {
+ status = gensec_sign_packet(spnego_state->sub_sec_security,
+ n,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ &mech_list_mic);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("failed to sign mechListMIC: %s\n",
+ nt_errstr(status));
+ return status;
+ }
+ spnego_state->needs_mic_sign = false;
}
- case SPNEGO_CLIENT_TARG:
- {
- NTSTATUS nt_status = NT_STATUS_INTERNAL_ERROR;
- if (!in.length) {
- return NT_STATUS_INVALID_PARAMETER;
- }
+ client_response:
+ if (sub_out.length == 0 && mech_list_mic.length == 0) {
+ *out = data_blob_null;
- len = spnego_read_data(gensec_security, in, &spnego);
+ if (!spnego_state->sub_sec_ready) {
+ /* somethings wrong here... */
+ DBG_ERR("gensec_update not ready without output\n");
+ return NT_STATUS_INTERNAL_ERROR;
+ }
- if (len == -1) {
- DEBUG(1, ("Invalid SPNEGO request:\n"));
- dump_data(1, in.data, in.length);
+ if (ta->negResult != SPNEGO_ACCEPT_COMPLETED) {
+ /* unless of course it did not accept */
+ DBG_WARNING("gensec_update ok but not accepted\n");
return NT_STATUS_INVALID_PARAMETER;
}
- /* OK, so it's real SPNEGO, check the packet's the one we expect */
- if (spnego.type != spnego_state->expected_packet) {
- DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
- spnego_state->expected_packet));
- dump_data(1, in.data, in.length);
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
+ if (!spnego_state->needs_mic_check) {
+ spnego_state->state_position = SPNEGO_DONE;
+ return NT_STATUS_OK;
}
+ }
- spnego_state->num_targs++;
+ /* compose reply */
+ spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
+ spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
+ spnego_out.negTokenTarg.supportedMech = NULL;
+ spnego_out.negTokenTarg.responseToken = sub_out;
+ spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
- if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
- spnego_free_data(&spnego);
- return NT_STATUS_LOGON_FAILURE;
- }
+ if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+ DBG_WARNING("Failed to write NEG_TOKEN_TARG\n");
+ return NT_STATUS_INVALID_PARAMETER;
+ }
- if (spnego.negTokenTarg.negResult == SPNEGO_REQUEST_MIC) {
- spnego_state->mic_requested = true;
+ spnego_state->num_targs++;
+
+ /* set next state */
+ spnego_state->state_position = SPNEGO_CLIENT_TARG;
+ spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+}
+
+static const struct spnego_neg_ops gensec_spnego_client_negTokenTarg_ops = {
+ .name = "client_negTokenTarg",
+ .start_fn = gensec_spnego_client_negTokenTarg_start,
+ .step_fn = gensec_spnego_client_negTokenTarg_step,
+ .finish_fn = gensec_spnego_client_negTokenTarg_finish,
+};
+
+/** create a server negTokenTarg
+ *
+ * This is the case, where the client is the first one who sends data
+*/
+
+static NTSTATUS gensec_spnego_server_response(struct spnego_state *spnego_state,
+ TALLOC_CTX *out_mem_ctx,
+ NTSTATUS nt_status,
+ const DATA_BLOB unwrapped_out,
+ DATA_BLOB mech_list_mic,
+ DATA_BLOB *out)
+{
+ struct spnego_data spnego_out;
+
+ /* compose reply */
+ spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
+ spnego_out.negTokenTarg.responseToken = unwrapped_out;
+ spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
+ spnego_out.negTokenTarg.supportedMech = NULL;
+
+ if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+ spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
+ if (spnego_state->mic_requested) {
+ spnego_out.negTokenTarg.negResult = SPNEGO_REQUEST_MIC;
+ spnego_state->mic_requested = false;
+ } else {
+ spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
+ }
+ spnego_state->state_position = SPNEGO_SERVER_TARG;
+ } else if (NT_STATUS_IS_OK(nt_status)) {
+ if (unwrapped_out.data) {
+ spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
}
+ spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
+ spnego_state->state_position = SPNEGO_DONE;
+ }
- /* Server didn't like our choice of mech, and chose something else */
- if (((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) ||
- (spnego.negTokenTarg.negResult == SPNEGO_REQUEST_MIC)) &&
- spnego.negTokenTarg.supportedMech &&
- strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
- DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
- gensec_get_name_by_oid(gensec_security, spnego_state->neg_oid),
- gensec_get_name_by_oid(gensec_security, spnego.negTokenTarg.supportedMech)));
- spnego_state->downgraded = true;
- gensec_spnego_update_sub_abort(spnego_state);
- nt_status = gensec_subcontext_start(spnego_state,
- gensec_security,
- &spnego_state->sub_sec_security);
- if (!NT_STATUS_IS_OK(nt_status)) {
- spnego_free_data(&spnego);
- return nt_status;
- }
- /* select the sub context */
- nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
- spnego.negTokenTarg.supportedMech);
- if (!NT_STATUS_IS_OK(nt_status)) {
- spnego_free_data(&spnego);
- return nt_status;
+ if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
+ DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
+ spnego_state->num_targs++;
+
+ return nt_status;
+}
+
+static NTSTATUS gensec_spnego_server_negTokenInit_start(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ bool ok;
+
+ n->mech_idx = 0;
+ n->mech_types = spnego_in->negTokenInit.mechTypes;
+ if (n->mech_types == NULL) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ n->all_idx = 0;
+ n->all_sec = gensec_security_by_oid_list(gensec_security,
+ n, n->mech_types,
+ GENSEC_OID_SPNEGO);
+ if (n->all_sec == NULL) {
+ DBG_WARNING("gensec_security_by_oid_list() failed\n");
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ ok = spnego_write_mech_types(spnego_state,
+ n->mech_types,
+ &spnego_state->mech_types);
+ if (!ok) {
+ DBG_ERR("Failed to write mechTypes\n");
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ return n->ops->step_fn(gensec_security, spnego_state, n,
+ spnego_in, NT_STATUS_OK, in_mem_ctx, in_next);
+}
+
+static NTSTATUS gensec_spnego_server_negTokenInit_step(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS last_status,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ if (!NT_STATUS_IS_OK(last_status)) {
+ const struct gensec_security_ops_wrapper *cur_sec =
+ &n->all_sec[n->all_idx];
+ const char *next_mech = n->mech_types[n->mech_idx+1];
+ const struct gensec_security_ops_wrapper *next_sec = NULL;
+ const char *next = NULL;
+ int dbg_level = DBGLVL_WARNING;
+ bool allow_fallback = false;
+ NTSTATUS status = last_status;
+ size_t i;
+
+ for (i = 0; next_mech != NULL && n->all_sec[i].op != NULL; i++) {
+ if (strcmp(next_mech, n->all_sec[i].oid) != 0) {
+ continue;
}
- spnego_state->neg_oid = talloc_strdup(spnego_state,
- spnego.negTokenTarg.supportedMech);
- if (spnego_state->neg_oid == NULL) {
- spnego_free_data(&spnego);
- return NT_STATUS_NO_MEMORY;
- };
+ next_sec = &n->all_sec[i];
+ break;
+ }
+
+ if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER) ||
+ NT_STATUS_EQUAL(status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO))
+ {
+ allow_fallback = true;
+ }
+
+ if (allow_fallback && next_sec != NULL) {
+ next = next_sec->op->name;
+ dbg_level = DBGLVL_NOTICE;
}
- if (spnego.negTokenTarg.mechListMIC.length > 0) {
- DATA_BLOB *m = &spnego.negTokenTarg.mechListMIC;
- const DATA_BLOB *r = &spnego.negTokenTarg.responseToken;
+ DBG_PREFIX(dbg_level, (
+ "%s: parsing NEG_TOKEN_INIT content failed "
+ "(next[%s]): %s\n", cur_sec->op->name,
+ next, nt_errstr(status)));
+ if (next == NULL) {
/*
- * Windows 2000 has a bug, it repeats the
- * responseToken in the mechListMIC field.
+ * A hard error without a possible fallback.
*/
- if (m->length == r->length) {
- int cmp;
-
- cmp = memcmp(m->data, r->data, m->length);
- if (cmp == 0) {
- data_blob_free(m);
- }
- }
+ return status;
}
- if (spnego.negTokenTarg.mechListMIC.length > 0) {
- if (spnego_state->sub_sec_ready) {
- spnego_state->needs_mic_check = true;
+ /*
+ * Pretend we never started it
+ */
+ gensec_spnego_reset_sub_sec(spnego_state);
+
+ /*
+ * And try the next one, based on the clients
+ * mech type list...
+ */
+ n->mech_idx += 1;
+ }
+
+ /*
+ * we always reset all_idx here, as the negotiation is
+ * done via mech_idx!
+ */
+ n->all_idx = 0;
+
+ for (; n->mech_types[n->mech_idx] != NULL; n->mech_idx++) {
+ const char *cur_mech = n->mech_types[n->mech_idx];
+ const struct gensec_security_ops_wrapper *cur_sec = NULL;
+ NTSTATUS status;
+ DATA_BLOB sub_in = data_blob_null;
+ size_t i;
+
+ for (i = 0; n->all_sec[i].op != NULL; i++) {
+ if (strcmp(cur_mech, n->all_sec[i].oid) != 0) {
+ continue;
}
+
+ cur_sec = &n->all_sec[i];
+ n->all_idx = i;
+ break;
}
- if (spnego_state->needs_mic_check) {
- if (spnego.negTokenTarg.responseToken.length != 0) {
- DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
- spnego_free_data(&spnego);
- return NT_STATUS_INVALID_PARAMETER;
- }
+ if (cur_sec == NULL) {
+ continue;
+ }
- if (spnego.negTokenTarg.mechListMIC.length == 0
- && spnego_state->may_skip_mic_check) {
- /*
- * In this case we don't require
- * a mechListMIC from the server.
- *
- * This works around bugs in the Azure
- * and Apple spnego implementations.
- *
- * See
- * https://bugzilla.samba.org/show_bug.cgi?id=11994
- */
- spnego_state->needs_mic_check = false;
- nt_status = NT_STATUS_OK;
- goto client_response;
- }
+ status = gensec_subcontext_start(spnego_state,
+ gensec_security,
+ &spnego_state->sub_sec_security);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
- nt_status = gensec_check_packet(spnego_state->sub_sec_security,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- &spnego.negTokenTarg.mechListMIC);
- if (!NT_STATUS_IS_OK(nt_status)) {
- DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
- nt_errstr(nt_status)));
- spnego_free_data(&spnego);
- return nt_status;
- }
- spnego_state->needs_mic_check = false;
- spnego_state->done_mic_check = true;
- goto client_response;
+ /* select the sub context */
+ status = gensec_start_mech_by_ops(spnego_state->sub_sec_security,
+ cur_sec->op);
+ if (!NT_STATUS_IS_OK(status)) {
+ /*
+ * Pretend we never started it
+ */
+ gensec_spnego_reset_sub_sec(spnego_state);
+ continue;
}
- if (!spnego_state->sub_sec_ready) {
- nt_status = gensec_update_ev(spnego_state->sub_sec_security,
- out_mem_ctx, ev,
- spnego.negTokenTarg.responseToken,
- &unwrapped_out);
- if (NT_STATUS_IS_OK(nt_status)) {
- spnego_state->sub_sec_ready = true;
- }
- if (!NT_STATUS_IS_OK(nt_status)) {
- goto client_response;
- }
+ if (n->mech_idx == 0) {
+ /*
+ * We can use the optimistic token.
+ */
+ sub_in = spnego_in->negTokenInit.mechToken;
} else {
- nt_status = NT_STATUS_OK;
+ /*
+ * Indicate the downgrade and request a
+ * mic.
+ */
+ spnego_state->downgraded = true;
+ spnego_state->mic_requested = true;
}
- if (!spnego_state->done_mic_check) {
- bool have_sign = true;
- bool new_spnego = false;
+ /*
+ * Note that 'cur_sec' is temporary memory, but
+ * cur_sec->oid points to a const string in the
+ * backends gensec_security_ops structure.
+ */
+ spnego_state->neg_oid = cur_sec->oid;
- have_sign = gensec_have_feature(spnego_state->sub_sec_security,
- GENSEC_FEATURE_SIGN);
- if (spnego_state->simulate_w2k) {
- have_sign = false;
- }
- new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
- GENSEC_FEATURE_NEW_SPNEGO);
-
- switch (spnego.negTokenTarg.negResult) {
- case SPNEGO_ACCEPT_COMPLETED:
- case SPNEGO_NONE_RESULT:
- if (spnego_state->num_targs == 1) {
- /*
- * the first exchange doesn't require
- * verification
- */
- new_spnego = false;
- }
+ /* we need some content from the mech */
+ *in_next = sub_in;
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ }
- break;
+ DBG_WARNING("Could not find a suitable mechtype in NEG_TOKEN_INIT\n");
+ return NT_STATUS_INVALID_PARAMETER;
+}
- case SPNEGO_ACCEPT_INCOMPLETE:
- if (spnego.negTokenTarg.mechListMIC.length > 0) {
- new_spnego = true;
- break;
- }
+static NTSTATUS gensec_spnego_server_negTokenInit_finish(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS sub_status,
+ const DATA_BLOB sub_out,
+ TALLOC_CTX *out_mem_ctx,
+ DATA_BLOB *out)
+{
+ DATA_BLOB mech_list_mic = data_blob_null;
- if (spnego_state->downgraded) {
- /*
- * A downgrade should be protected if
- * supported
- */
- break;
- }
+ if (spnego_state->simulate_w2k) {
+ /*
+ * Windows 2000 returns the unwrapped token
+ * also in the mech_list_mic field.
+ *
+ * In order to verify our client code,
+ * we need a way to have a server with this
+ * broken behaviour
+ */
+ mech_list_mic = sub_out;
+ }
- /*
- * The caller may just asked for
- * GENSEC_FEATURE_SESSION_KEY, this
- * is only reflected in the want_features.
- *
- * As it will imply
- * gensec_have_features(GENSEC_FEATURE_SIGN)
- * to return true.
- */
- if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
- break;
- }
- if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
- break;
- }
- /*
- * Here we're sure our preferred mech was
- * selected by the server and our caller doesn't
- * need GENSEC_FEATURE_SIGN nor
- * GENSEC_FEATURE_SEAL support.
- *
- * In this case we don't require
- * a mechListMIC from the server.
- *
- * This works around bugs in the Azure
- * and Apple spnego implementations.
- *
- * See
- * https://bugzilla.samba.org/show_bug.cgi?id=11994
- */
- spnego_state->may_skip_mic_check = true;
- break;
+ return gensec_spnego_server_response(spnego_state,
+ out_mem_ctx,
+ sub_status,
+ sub_out,
+ mech_list_mic,
+ out);
+}
- case SPNEGO_REQUEST_MIC:
- if (spnego.negTokenTarg.mechListMIC.length > 0) {
- new_spnego = true;
- }
- break;
- default:
- break;
- }
+static const struct spnego_neg_ops gensec_spnego_server_negTokenInit_ops = {
+ .name = "server_negTokenInit",
+ .start_fn = gensec_spnego_server_negTokenInit_start,
+ .step_fn = gensec_spnego_server_negTokenInit_step,
+ .finish_fn = gensec_spnego_server_negTokenInit_finish,
+};
- if (spnego_state->mic_requested) {
- if (have_sign) {
- new_spnego = true;
- }
- }
+static NTSTATUS gensec_spnego_server_negTokenTarg_start(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ const struct spnego_negTokenTarg *ta = &spnego_in->negTokenTarg;
+ NTSTATUS status;
- if (have_sign && new_spnego) {
- spnego_state->needs_mic_check = true;
- spnego_state->needs_mic_sign = true;
- }
- }
+ spnego_state->num_targs++;
- if (spnego.negTokenTarg.mechListMIC.length > 0) {
- nt_status = gensec_check_packet(spnego_state->sub_sec_security,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- &spnego.negTokenTarg.mechListMIC);
- if (!NT_STATUS_IS_OK(nt_status)) {
- DEBUG(2,("GENSEC SPNEGO: failed to verify mechListMIC: %s\n",
- nt_errstr(nt_status)));
- spnego_free_data(&spnego);
- return nt_status;
- }
- spnego_state->needs_mic_check = false;
- spnego_state->done_mic_check = true;
- }
-
- if (spnego_state->needs_mic_sign) {
- nt_status = gensec_sign_packet(spnego_state->sub_sec_security,
- out_mem_ctx,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- spnego_state->mech_types.data,
- spnego_state->mech_types.length,
- &mech_list_mic);
- if (!NT_STATUS_IS_OK(nt_status)) {
- DEBUG(2,("GENSEC SPNEGO: failed to sign mechListMIC: %s\n",
- nt_errstr(nt_status)));
- spnego_free_data(&spnego);
- return nt_status;
- }
- spnego_state->needs_mic_sign = false;
+ if (spnego_state->sub_sec_security == NULL) {
+ DBG_ERR("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n");
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (spnego_state->needs_mic_check) {
+ if (ta->responseToken.length != 0) {
+ DBG_WARNING("non empty response token not expected\n");
+ return NT_STATUS_INVALID_PARAMETER;
}
- if (spnego_state->needs_mic_check) {
- nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+ status = gensec_check_packet(spnego_state->sub_sec_security,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ &ta->mechListMIC);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("failed to verify mechListMIC: %s\n",
+ nt_errstr(status));
+ return status;
}
- client_response:
- spnego_free_data(&spnego);
+ spnego_state->needs_mic_check = false;
+ spnego_state->done_mic_check = true;
+ return NT_STATUS_OK;
+ }
- if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
- && !NT_STATUS_IS_OK(nt_status)) {
- DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
- spnego_state->sub_sec_security->ops->name,
- nt_errstr(nt_status)));
- return nt_status;
- }
+ if (!spnego_state->sub_sec_ready) {
+ *in_next = ta->responseToken;
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ }
- if (unwrapped_out.length || mech_list_mic.length) {
- /* compose reply */
- spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
- spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
- spnego_out.negTokenTarg.supportedMech = NULL;
- spnego_out.negTokenTarg.responseToken = unwrapped_out;
- spnego_out.negTokenTarg.mechListMIC = mech_list_mic;
+ return NT_STATUS_OK;
+}
- if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
- DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
- return NT_STATUS_INVALID_PARAMETER;
- }
+static NTSTATUS gensec_spnego_server_negTokenTarg_step(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS last_status,
+ TALLOC_CTX *in_mem_ctx,
+ DATA_BLOB *in_next)
+{
+ if (GENSEC_UPDATE_IS_NTERROR(last_status)) {
+ DBG_NOTICE("SPNEGO(%s) login failed: %s\n",
+ spnego_state->sub_sec_security->ops->name,
+ nt_errstr(last_status));
+ return last_status;
+ }
- spnego_state->num_targs++;
- spnego_state->state_position = SPNEGO_CLIENT_TARG;
- nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
- } else {
+ /*
+ * This should never be reached!
+ * The step function is only called on errors!
+ */
+ smb_panic(__location__);
+ return NT_STATUS_INTERNAL_ERROR;
+}
- /* all done - server has accepted, and we agree */
- *out = data_blob_null;
+static NTSTATUS gensec_spnego_server_negTokenTarg_finish(
+ struct gensec_security *gensec_security,
+ struct spnego_state *spnego_state,
+ struct spnego_neg_state *n,
+ struct spnego_data *spnego_in,
+ NTSTATUS sub_status,
+ const DATA_BLOB sub_out,
+ TALLOC_CTX *out_mem_ctx,
+ DATA_BLOB *out)
+{
+ const struct spnego_negTokenTarg *ta = &spnego_in->negTokenTarg;
+ DATA_BLOB mech_list_mic = data_blob_null;
+ NTSTATUS status;
+ bool have_sign = true;
+ bool new_spnego = false;
- if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
- /* unless of course it did not accept */
- DEBUG(1,("gensec_update ok but not accepted\n"));
- nt_status = NT_STATUS_INVALID_PARAMETER;
- }
+ status = sub_status;
- spnego_state->state_position = SPNEGO_DONE;
- }
+ if (!spnego_state->sub_sec_ready) {
+ /*
+ * We're not yet ready to deal with signatures.
+ */
+ goto server_response;
+ }
- return nt_status;
+ if (spnego_state->done_mic_check) {
+ /*
+ * We already checked the mic,
+ * either the in last round here
+ * in gensec_spnego_server_negTokenTarg_finish()
+ * or during this round in
+ * gensec_spnego_server_negTokenTarg_start().
+ *
+ * Both cases we're sure we don't have to
+ * call gensec_sign_packet().
+ */
+ goto server_response;
}
- case SPNEGO_DONE:
- /* We should not be called after we are 'done' */
- return NT_STATUS_INVALID_PARAMETER;
+
+ have_sign = gensec_have_feature(spnego_state->sub_sec_security,
+ GENSEC_FEATURE_SIGN);
+ if (spnego_state->simulate_w2k) {
+ have_sign = false;
}
- return NT_STATUS_INVALID_PARAMETER;
+ new_spnego = gensec_have_feature(spnego_state->sub_sec_security,
+ GENSEC_FEATURE_NEW_SPNEGO);
+ if (ta->mechListMIC.length > 0) {
+ new_spnego = true;
+ }
+
+ if (have_sign && new_spnego) {
+ spnego_state->needs_mic_check = true;
+ spnego_state->needs_mic_sign = true;
+ }
+
+ if (have_sign && ta->mechListMIC.length > 0) {
+ status = gensec_check_packet(spnego_state->sub_sec_security,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ &ta->mechListMIC);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("failed to verify mechListMIC: %s\n",
+ nt_errstr(status));
+ return status;
+ }
+
+ spnego_state->needs_mic_check = false;
+ spnego_state->done_mic_check = true;
+ }
+
+ if (spnego_state->needs_mic_sign) {
+ status = gensec_sign_packet(spnego_state->sub_sec_security,
+ n,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ spnego_state->mech_types.data,
+ spnego_state->mech_types.length,
+ &mech_list_mic);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_WARNING("failed to sign mechListMIC: %s\n",
+ nt_errstr(status));
+ return status;
+ }
+ spnego_state->needs_mic_sign = false;
+ }
+
+ if (spnego_state->needs_mic_check) {
+ status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+ }
+
+ server_response:
+ return gensec_spnego_server_response(spnego_state,
+ out_mem_ctx,
+ status,
+ sub_out,
+ mech_list_mic,
+ out);
}
+static const struct spnego_neg_ops gensec_spnego_server_negTokenTarg_ops = {
+ .name = "server_negTokenTarg",
+ .start_fn = gensec_spnego_server_negTokenTarg_start,
+ .step_fn = gensec_spnego_server_negTokenTarg_step,
+ .finish_fn = gensec_spnego_server_negTokenTarg_finish,
+};
+
struct gensec_spnego_update_state {
+ struct tevent_context *ev;
struct gensec_security *gensec;
struct spnego_state *spnego;
+
DATA_BLOB full_in;
+ struct spnego_data _spnego_in;
+ struct spnego_data *spnego_in;
+
+ struct {
+ bool needed;
+ DATA_BLOB in;
+ NTSTATUS status;
+ DATA_BLOB out;
+ } sub;
+
+ struct spnego_neg_state *n;
+
NTSTATUS status;
DATA_BLOB out;
};
static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
const DATA_BLOB in, TALLOC_CTX *mem_ctx,
DATA_BLOB *full_in);
+static void gensec_spnego_update_pre(struct tevent_req *req);
+static void gensec_spnego_update_done(struct tevent_req *subreq);
+static void gensec_spnego_update_post(struct tevent_req *req);
static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB *_out);
struct tevent_req *req = NULL;
struct gensec_spnego_update_state *state = NULL;
NTSTATUS status;
+ ssize_t len;
req = tevent_req_create(mem_ctx, &state,
struct gensec_spnego_update_state);
if (req == NULL) {
return NULL;
}
+ state->ev = ev;
state->gensec = gensec_security;
state->spnego = spnego_state;
tevent_req_set_cleanup_fn(req, gensec_spnego_update_cleanup);
status = gensec_spnego_update_out(gensec_security,
state, &state->out);
- state->status = status;
- if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
- tevent_req_done(req);
- return tevent_req_post(req, ev);
- }
- if (tevent_req_nterror(req, status)) {
+ if (GENSEC_UPDATE_IS_NTERROR(status)) {
+ tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
+ state->status = status;
tevent_req_done(req);
return tevent_req_post(req, ev);
}
return tevent_req_post(req, ev);
}
- status = gensec_spnego_update(gensec_security,
- state, ev,
- state->full_in,
- &spnego_state->out_frag);
- if (NT_STATUS_IS_OK(status)) {
- bool reset_full = true;
+ /* Check if we got a valid SPNEGO blob... */
- reset_full = !spnego_state->done_mic_check;
+ switch (spnego_state->state_position) {
+ case SPNEGO_FALLBACK:
+ break;
- status = gensec_may_reset_crypto(spnego_state->sub_sec_security,
- reset_full);
+ case SPNEGO_CLIENT_TARG:
+ case SPNEGO_SERVER_TARG:
+ if (state->full_in.length == 0) {
+ tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+ return tevent_req_post(req, ev);
+ }
+
+ FALL_THROUGH;
+ case SPNEGO_CLIENT_START:
+ case SPNEGO_SERVER_START:
+
+ if (state->full_in.length == 0) {
+ /* create_negTokenInit later */
+ break;
+ }
+
+ len = spnego_read_data(state,
+ state->full_in,
+ &state->_spnego_in);
+ if (len == -1) {
+ if (spnego_state->state_position != SPNEGO_SERVER_START) {
+ DEBUG(1, ("Invalid SPNEGO request:\n"));
+ dump_data(1, state->full_in.data,
+ state->full_in.length);
+ tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+ return tevent_req_post(req, ev);
+ }
+
+ /*
+ * This is the 'fallback' case, where we don't get
+ * SPNEGO, and have to try all the other options (and
+ * hope they all have a magic string they check)
+ */
+ status = gensec_spnego_server_try_fallback(gensec_security,
+ spnego_state,
+ state,
+ state->full_in);
+ if (tevent_req_nterror(req, status)) {
+ return tevent_req_post(req, ev);
+ }
+
+ /*
+ * We'll continue with SPNEGO_FALLBACK below...
+ */
+ break;
+ }
+ state->spnego_in = &state->_spnego_in;
+
+ /* OK, so it's real SPNEGO, check the packet's the one we expect */
+ if (state->spnego_in->type != spnego_state->expected_packet) {
+ DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n",
+ state->spnego_in->type,
+ spnego_state->expected_packet));
+ dump_data(1, state->full_in.data,
+ state->full_in.length);
+ tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
+ return tevent_req_post(req, ev);
+ }
+
+ break;
+
+ default:
+ smb_panic(__location__);
+ return NULL;
}
- if (!NT_STATUS_IS_OK(status) &&
- !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
- tevent_req_nterror(req, status);
+
+ gensec_spnego_update_pre(req);
+ if (!tevent_req_is_in_progress(req)) {
return tevent_req_post(req, ev);
}
- spnego_state->out_status = status;
+ if (state->sub.needed) {
+ struct tevent_req *subreq = NULL;
- status = gensec_spnego_update_out(gensec_security,
- state, &state->out);
- state->status = status;
- if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
- tevent_req_done(req);
- return tevent_req_post(req, ev);
+ /*
+ * We may need one more roundtrip...
+ */
+ subreq = gensec_update_send(state, state->ev,
+ spnego_state->sub_sec_security,
+ state->sub.in);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq,
+ gensec_spnego_update_done,
+ req);
+ state->sub.needed = false;
+ return req;
}
- if (tevent_req_nterror(req, status)) {
+
+ gensec_spnego_update_post(req);
+ if (!tevent_req_is_in_progress(req)) {
return tevent_req_post(req, ev);
}
- tevent_req_done(req);
- return tevent_req_post(req, ev);
+ return req;
}
static NTSTATUS gensec_spnego_update_in(struct gensec_security *gensec_security,
const DATA_BLOB in, TALLOC_CTX *mem_ctx,
DATA_BLOB *full_in)
{
- struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
+ struct spnego_state *spnego_state =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct spnego_state);
size_t expected;
bool ok;
*full_in = data_blob_null;
+ switch (spnego_state->state_position) {
+ case SPNEGO_FALLBACK:
+ *full_in = in;
+ spnego_state->in_needed = 0;
+ return NT_STATUS_OK;
+
+ case SPNEGO_CLIENT_START:
+ case SPNEGO_CLIENT_TARG:
+ case SPNEGO_SERVER_START:
+ case SPNEGO_SERVER_TARG:
+ break;
+
+ case SPNEGO_DONE:
+ default:
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
if (spnego_state->in_needed == 0) {
size_t size = 0;
int ret;
return NT_STATUS_OK;
}
+static void gensec_spnego_update_pre(struct tevent_req *req)
+{
+ struct gensec_spnego_update_state *state =
+ tevent_req_data(req,
+ struct gensec_spnego_update_state);
+ struct spnego_state *spnego_state = state->spnego;
+ const struct spnego_neg_ops *ops = NULL;
+ NTSTATUS status;
+
+ state->sub.needed = false;
+ state->sub.in = data_blob_null;
+ state->sub.status = NT_STATUS_INTERNAL_ERROR;
+ state->sub.out = data_blob_null;
+
+ if (spnego_state->state_position == SPNEGO_FALLBACK) {
+ state->sub.in = state->full_in;
+ state->full_in = data_blob_null;
+ state->sub.needed = true;
+ return;
+ }
+
+ switch (spnego_state->state_position) {
+ case SPNEGO_CLIENT_START:
+ if (state->spnego_in == NULL) {
+ /* client to produce negTokenInit */
+ ops = &gensec_spnego_create_negTokenInit_ops;
+ break;
+ }
+
+ ops = &gensec_spnego_client_negTokenInit_ops;
+ break;
+
+ case SPNEGO_CLIENT_TARG:
+ ops = &gensec_spnego_client_negTokenTarg_ops;
+ break;
+
+ case SPNEGO_SERVER_START:
+ if (state->spnego_in == NULL) {
+ /* server to produce negTokenInit */
+ ops = &gensec_spnego_create_negTokenInit_ops;
+ break;
+ }
+
+ ops = &gensec_spnego_server_negTokenInit_ops;
+ break;
+
+ case SPNEGO_SERVER_TARG:
+ ops = &gensec_spnego_server_negTokenTarg_ops;
+ break;
+
+ default:
+ smb_panic(__location__);
+ return;
+ }
+
+ state->n = gensec_spnego_neg_state(state, ops);
+ if (tevent_req_nomem(state->n, req)) {
+ return;
+ }
+
+ status = ops->start_fn(state->gensec, spnego_state, state->n,
+ state->spnego_in, state, &state->sub.in);
+ if (GENSEC_UPDATE_IS_NTERROR(status)) {
+ tevent_req_nterror(req, status);
+ return;
+ }
+
+ if (NT_STATUS_IS_OK(status)) {
+ /*
+ * Call finish_fn() with an empty
+ * blob and NT_STATUS_OK.
+ */
+ state->sub.status = NT_STATUS_OK;
+ } else {
+ /*
+ * MORE_PROCESSING_REQUIRED =>
+ * we need to call gensec_update_send().
+ */
+ state->sub.needed = true;
+ }
+}
+
+static void gensec_spnego_update_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req =
+ tevent_req_callback_data(subreq,
+ struct tevent_req);
+ struct gensec_spnego_update_state *state =
+ tevent_req_data(req,
+ struct gensec_spnego_update_state);
+ struct spnego_state *spnego_state = state->spnego;
+
+ state->sub.status = gensec_update_recv(subreq, state, &state->sub.out);
+ TALLOC_FREE(subreq);
+ if (NT_STATUS_IS_OK(state->sub.status)) {
+ spnego_state->sub_sec_ready = true;
+ }
+
+ gensec_spnego_update_post(req);
+}
+
+static void gensec_spnego_update_post(struct tevent_req *req)
+{
+ struct gensec_spnego_update_state *state =
+ tevent_req_data(req,
+ struct gensec_spnego_update_state);
+ struct spnego_state *spnego_state = state->spnego;
+ const struct spnego_neg_ops *ops = NULL;
+ NTSTATUS status;
+
+ state->sub.in = data_blob_null;
+ state->sub.needed = false;
+
+ if (spnego_state->state_position == SPNEGO_FALLBACK) {
+ status = state->sub.status;
+ spnego_state->out_frag = state->sub.out;
+ talloc_steal(spnego_state, spnego_state->out_frag.data);
+ state->sub.out = data_blob_null;
+ goto respond;
+ }
+
+ ops = state->n->ops;
+
+ if (GENSEC_UPDATE_IS_NTERROR(state->sub.status)) {
+
+
+ /*
+ * gensec_update_recv() returned an error,
+ * let's see if the step_fn() want to
+ * handle it and negotiate something else.
+ */
+
+ status = ops->step_fn(state->gensec,
+ spnego_state,
+ state->n,
+ state->spnego_in,
+ state->sub.status,
+ state,
+ &state->sub.in);
+ if (GENSEC_UPDATE_IS_NTERROR(status)) {
+ tevent_req_nterror(req, status);
+ return;
+ }
+
+ state->sub.out = data_blob_null;
+ state->sub.status = NT_STATUS_INTERNAL_ERROR;
+
+ if (NT_STATUS_IS_OK(status)) {
+ /*
+ * Call finish_fn() with an empty
+ * blob and NT_STATUS_OK.
+ */
+ state->sub.status = NT_STATUS_OK;
+ } else {
+ /*
+ * MORE_PROCESSING_REQUIRED...
+ */
+ state->sub.needed = true;
+ }
+ }
+
+ if (state->sub.needed) {
+ struct tevent_req *subreq = NULL;
+
+ /*
+ * We may need one more roundtrip...
+ */
+ subreq = gensec_update_send(state, state->ev,
+ spnego_state->sub_sec_security,
+ state->sub.in);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq,
+ gensec_spnego_update_done,
+ req);
+ state->sub.needed = false;
+ return;
+ }
+
+ status = ops->finish_fn(state->gensec,
+ spnego_state,
+ state->n,
+ state->spnego_in,
+ state->sub.status,
+ state->sub.out,
+ spnego_state,
+ &spnego_state->out_frag);
+ TALLOC_FREE(state->n);
+ if (GENSEC_UPDATE_IS_NTERROR(status)) {
+ tevent_req_nterror(req, status);
+ return;
+ }
+
+ if (NT_STATUS_IS_OK(status)) {
+ bool reset_full = true;
+
+ reset_full = !spnego_state->done_mic_check;
+
+ status = gensec_may_reset_crypto(spnego_state->sub_sec_security,
+ reset_full);
+ if (tevent_req_nterror(req, status)) {
+ return;
+ }
+ }
+
+respond:
+ spnego_state->out_status = status;
+
+ status = gensec_spnego_update_out(state->gensec,
+ state, &state->out);
+ if (GENSEC_UPDATE_IS_NTERROR(status)) {
+ tevent_req_nterror(req, status);
+ return;
+ }
+
+ state->status = status;
+ tevent_req_done(req);
+ return;
+}
+
static NTSTATUS gensec_spnego_update_out(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB *_out)
{
- struct spnego_state *spnego_state = (struct spnego_state *)gensec_security->private_data;
+ struct spnego_state *spnego_state =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct spnego_state);
DATA_BLOB out = data_blob_null;
bool ok;
.expire_time = gensec_child_expire_time,
.final_auth_type = gensec_child_final_auth_type,
.enabled = true,
- .priority = GENSEC_SPNEGO
+ .priority = GENSEC_SPNEGO,
+ .glue = true,
};
_PUBLIC_ NTSTATUS gensec_spnego_init(TALLOC_CTX *ctx)
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