Kerberos backend for GENSEC
- Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
- Copyright (C) Stefan Metzmacher <metze@samba.org> 2005
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+ Copyright (C) Stefan Metzmacher <metze@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
#include "includes.h"
#include "system/kerberos.h"
-#include "system/network.h"
#include "auth/kerberos/kerberos.h"
-#include "librpc/gen_ndr/ndr_krb5pac.h"
+#include "librpc/gen_ndr/krb5pac.h"
#include "auth/auth.h"
+#include "lib/ldb/include/ldb.h"
+#include "auth/auth_sam.h"
+#include "librpc/rpc/dcerpc.h"
-#undef DBGC_CLASS
-#define DBGC_CLASS DBGC_AUTH
+enum gensec_gssapi_sasl_state
+{
+ STAGE_GSS_NEG,
+ STAGE_SASL_SSF_NEG,
+ STAGE_SASL_SSF_ACCEPT,
+ STAGE_DONE
+};
+
+#define NEG_SEAL 0x4
+#define NEG_SIGN 0x2
+#define NEG_NONE 0x1
struct gensec_gssapi_state {
gss_ctx_id_t gssapi_context;
DATA_BLOB pac;
struct smb_krb5_context *smb_krb5_context;
- krb5_ccache ccache;
- const char *ccache_name;
-
- gss_cred_id_t cred;
+ struct gssapi_creds_container *client_cred;
+ struct gssapi_creds_container *server_cred;
+
+ gss_cred_id_t delegated_cred_handle;
+
+ BOOL sasl; /* We have two different mechs in this file: One
+ * for SASL wrapped GSSAPI and another for normal
+ * GSSAPI */
+ enum gensec_gssapi_sasl_state sasl_state;
+ uint8_t sasl_protection; /* What was negotiated at the SASL
+ * layer, independent of the GSSAPI
+ * layer... */
};
static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
struct gensec_gssapi_state *gensec_gssapi_state = ptr;
OM_uint32 maj_stat, min_stat;
- if (gensec_gssapi_state->cred != GSS_C_NO_CREDENTIAL) {
+ if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
maj_stat = gss_release_cred(&min_stat,
- &gensec_gssapi_state->cred);
+ &gensec_gssapi_state->delegated_cred_handle);
}
if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
if (!gensec_gssapi_state) {
return NT_STATUS_NO_MEMORY;
}
+
+ gensec_gssapi_state->sasl = False;
+ gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
gensec_security->private_data = gensec_gssapi_state;
gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
gensec_gssapi_state->want_flags = 0;
+ if (lp_parm_bool(-1, "gensec_gssapi", "mutual", True)) {
+ gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
+ }
+ if (lp_parm_bool(-1, "gensec_gssapi", "delegation", True)) {
+ gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
+ }
+ if (lp_parm_bool(-1, "gensec_gssapi", "sequence", True)) {
+ gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
+ }
+
gensec_gssapi_state->got_flags = 0;
gensec_gssapi_state->session_key = data_blob(NULL, 0);
gensec_gssapi_state->pac = data_blob(NULL, 0);
- gensec_gssapi_state->cred = GSS_C_NO_CREDENTIAL;
+ gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destory);
- if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
-#ifndef HAVE_GSSKRB5_GET_INITIATOR_SUBKEY
- /* GSSAPI won't give us the session keys, without the
- * right hooks. This is critical when requested, so
- * fail outright. */
- return NT_STATUS_INVALID_PARAMETER;
-#endif
- }
if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
}
gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
}
if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
-#ifndef GSS_C_DCE_STYLE
- /* GSSAPI DCE_STYLE is critical when requested, so
- * fail outright */
- return NT_STATUS_INVALID_PARAMETER;
-#else
gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
-#endif
}
gensec_gssapi_state->gss_oid = gss_mech_krb5;
static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
{
NTSTATUS nt_status;
+ int ret;
struct gensec_gssapi_state *gensec_gssapi_state;
+ struct cli_credentials *machine_account;
+ struct gssapi_creds_container *gcc;
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
- gensec_gssapi_state = gensec_security->private_data;
+ gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
+
+ machine_account = gensec_get_credentials(gensec_security);
+
+ if (!machine_account) {
+ DEBUG(3, ("No machine account credentials specified\n"));
+ return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+ } else {
+ ret = cli_credentials_get_server_gss_creds(machine_account, &gcc);
+ if (ret) {
+ DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
+ error_message(ret)));
+ return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+ }
+ }
+ gensec_gssapi_state->server_cred = gcc;
return NT_STATUS_OK;
+
+}
+
+static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
+{
+ NTSTATUS nt_status;
+ struct gensec_gssapi_state *gensec_gssapi_state;
+ nt_status = gensec_gssapi_server_start(gensec_security);
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
+ gensec_gssapi_state->sasl = True;
+ }
+ return nt_status;
}
static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
{
struct gensec_gssapi_state *gensec_gssapi_state;
+ struct cli_credentials *creds = gensec_get_credentials(gensec_security);
+ krb5_error_code ret;
NTSTATUS nt_status;
gss_buffer_desc name_token;
+ gss_OID name_type;
OM_uint32 maj_stat, min_stat;
+ const char *hostname = gensec_get_target_hostname(gensec_security);
+ const char *principal;
+ struct gssapi_creds_container *gcc;
+
+ if (!hostname) {
+ DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (is_ipaddress(hostname)) {
+ DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (strequal(hostname, "localhost")) {
+ DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
- gensec_gssapi_state = gensec_security->private_data;
+ gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
- name_token.value = talloc_asprintf(gensec_gssapi_state, "%s@%s",
- gensec_get_target_service(gensec_security),
- gensec_get_target_hostname(gensec_security));
- name_token.length = strlen(name_token.value);
+ principal = gensec_get_target_principal(gensec_security);
+ if (principal && lp_client_use_spnego_principal()) {
+ name_token.value = discard_const_p(uint8_t, principal);
+ name_token.length = strlen(principal);
- maj_stat = gss_import_name (&min_stat,
- &name_token,
- GSS_C_NT_HOSTBASED_SERVICE,
- &gensec_gssapi_state->server_name);
- if (maj_stat) {
- DEBUG(1, ("GSS Import name of %s failed: %s\n",
- (char *)name_token.value,
- gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
- return NT_STATUS_UNSUCCESSFUL;
- }
+ name_type = GSS_C_NULL_OID;
+ } else {
+ principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
+ gensec_get_target_service(gensec_security),
+ hostname);
+
+ name_token.value = discard_const_p(uint8_t, principal);
+ name_token.length = strlen(principal);
- name_token.value = cli_credentials_get_principal(gensec_get_credentials(gensec_security),
- gensec_gssapi_state),
- name_token.length = strlen(name_token.value);
+ name_type = GSS_C_NT_HOSTBASED_SERVICE;
+ }
maj_stat = gss_import_name (&min_stat,
&name_token,
- GSS_C_NT_USER_NAME,
- &gensec_gssapi_state->client_name);
+ name_type,
+ &gensec_gssapi_state->server_name);
if (maj_stat) {
- DEBUG(1, ("GSS Import name of %s failed: %s\n",
+ DEBUG(2, ("GSS Import name of %s failed: %s\n",
(char *)name_token.value,
gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
- return NT_STATUS_UNSUCCESSFUL;
- }
-
- initialize_krb5_error_table();
-
- nt_status = kinit_to_ccache(gensec_gssapi_state,
- gensec_get_credentials(gensec_security),
- gensec_gssapi_state->smb_krb5_context,
- &gensec_gssapi_state->ccache, &gensec_gssapi_state->ccache_name);
- if (!NT_STATUS_IS_OK(nt_status)) {
- return nt_status;
+ return NT_STATUS_INVALID_PARAMETER;
}
-#ifdef HAVE_GSS_KRB5_CCACHE_NAME /* FIXME, we need an alternate function */
- maj_stat = gss_krb5_ccache_name(&min_stat,
- gensec_gssapi_state->ccache_name,
- NULL);
- if (maj_stat) {
- DEBUG(1, ("GSS krb5 ccache set %s failed: %s\n",
- gensec_gssapi_state->ccache_name,
- gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
+ ret = cli_credentials_get_client_gss_creds(creds, &gcc);
+ switch (ret) {
+ case 0:
+ break;
+ case KRB5_KDC_UNREACH:
+ DEBUG(3, ("Cannot reach a KDC we require\n"));
+ return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
+ default:
+ DEBUG(1, ("Aquiring initiator credentails failed\n"));
return NT_STATUS_UNSUCCESSFUL;
}
-#endif
- maj_stat = gss_acquire_cred(&min_stat,
- gensec_gssapi_state->client_name,
- GSS_C_INDEFINITE,
- GSS_C_NULL_OID_SET,
- GSS_C_INITIATE,
- &gensec_gssapi_state->cred,
- NULL,
- NULL);
- if (maj_stat) {
- DEBUG(1, ("Aquiring initiator credentails failed: %s\n",
- gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
- return NT_STATUS_UNSUCCESSFUL;
- }
+ gensec_gssapi_state->client_cred = gcc;
return NT_STATUS_OK;
}
+static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
+{
+ NTSTATUS nt_status;
+ struct gensec_gssapi_state *gensec_gssapi_state;
+ nt_status = gensec_gssapi_client_start(gensec_security);
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
+ gensec_gssapi_state->sasl = True;
+ }
+ return nt_status;
+}
+
+
+/**
+ * Check if the packet is one for this mechansim
+ *
+ * @param gensec_security GENSEC state
+ * @param in The request, as a DATA_BLOB
+ * @return Error, INVALID_PARAMETER if it's not a packet for us
+ * or NT_STATUS_OK if the packet is ok.
+ */
+
+static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
+ const DATA_BLOB *in)
+{
+ if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
+ return NT_STATUS_OK;
+ } else {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+}
/**
const DATA_BLOB in, DATA_BLOB *out)
{
struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
- NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+ NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
OM_uint32 maj_stat, min_stat;
OM_uint32 min_stat2;
gss_buffer_desc input_token, output_token;
input_token.length = in.length;
input_token.value = in.data;
- switch (gensec_security->gensec_role) {
- case GENSEC_CLIENT:
+ switch (gensec_gssapi_state->sasl_state) {
+ case STAGE_GSS_NEG:
{
- maj_stat = gss_init_sec_context(&min_stat,
- GSS_C_NO_CREDENTIAL,
- &gensec_gssapi_state->gssapi_context,
- gensec_gssapi_state->server_name,
- discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
- gensec_gssapi_state->want_flags,
- 0,
- gensec_gssapi_state->input_chan_bindings,
- &input_token,
- NULL,
- &output_token,
- &gensec_gssapi_state->got_flags, /* ret flags */
- NULL);
+ switch (gensec_security->gensec_role) {
+ case GENSEC_CLIENT:
+ {
+ maj_stat = gss_init_sec_context(&min_stat,
+ gensec_gssapi_state->client_cred->creds,
+ &gensec_gssapi_state->gssapi_context,
+ gensec_gssapi_state->server_name,
+ discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
+ gensec_gssapi_state->want_flags,
+ 0,
+ gensec_gssapi_state->input_chan_bindings,
+ &input_token,
+ NULL,
+ &output_token,
+ &gensec_gssapi_state->got_flags, /* ret flags */
+ NULL);
+ break;
+ }
+ case GENSEC_SERVER:
+ {
+ maj_stat = gss_accept_sec_context(&min_stat,
+ &gensec_gssapi_state->gssapi_context,
+ gensec_gssapi_state->server_cred->creds,
+ &input_token,
+ gensec_gssapi_state->input_chan_bindings,
+ &gensec_gssapi_state->client_name,
+ &gss_oid_p,
+ &output_token,
+ &gensec_gssapi_state->got_flags,
+ NULL,
+ &gensec_gssapi_state->delegated_cred_handle);
+ gensec_gssapi_state->gss_oid = gss_oid_p;
+ break;
+ }
+ default:
+ return NT_STATUS_INVALID_PARAMETER;
+
+ }
+
+ if (maj_stat == GSS_S_COMPLETE) {
+ *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
+ gss_release_buffer(&min_stat2, &output_token);
+
+ if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
+ DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
+ } else {
+ DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
+ }
+
+ /* We may have been invoked as SASL, so there
+ * is more work to do */
+ if (gensec_gssapi_state->sasl) {
+ /* Due to a very subtle interaction
+ * with SASL and the LDAP libs, we
+ * must ensure the data pointer is
+ * != NULL, but the length is 0.
+ *
+ * This ensures we send a 'zero
+ * length' (rather than NULL) response
+ */
+
+ if (!out->data) {
+ out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
+ }
+
+ gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ } else {
+ gensec_gssapi_state->sasl_state = STAGE_DONE;
+
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
+ DEBUG(3, ("GSSAPI Connection will be cryptographicly sealed\n"));
+ } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+ DEBUG(3, ("GSSAPI Connection will be cryptographicly signed\n"));
+ } else {
+ DEBUG(3, ("GSSAPI Connection will have no cryptographicly protection\n"));
+ }
+
+ return NT_STATUS_OK;
+ }
+ } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
+ *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
+ gss_release_buffer(&min_stat2, &output_token);
+
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ } else if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
+ && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
+ gensec_gssapi_state->gss_oid->length) == 0)) {
+ switch (min_stat) {
+ case KRB5_KDC_UNREACH:
+ DEBUG(3, ("Cannot reach a KDC we require: %s\n",
+ gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
+ return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
+ case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
+ DEBUG(3, ("Server is not registered with our KDC: %s\n",
+ gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
+ return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
+ case KRB5KRB_AP_ERR_MSG_TYPE:
+ /* garbage input, possibly from the auto-mech detection */
+ return NT_STATUS_INVALID_PARAMETER;
+ default:
+ DEBUG(1, ("GSS(krb5) Update failed: %s\n",
+ gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
+ return nt_status;
+ }
+ } else {
+ DEBUG(1, ("GSS Update failed: %s\n",
+ gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
+ return nt_status;
+ }
break;
}
- case GENSEC_SERVER:
+ /* These last two stages are only done if we were invoked as SASL */
+ case STAGE_SASL_SSF_NEG:
{
- maj_stat = gss_accept_sec_context(&min_stat,
- &gensec_gssapi_state->gssapi_context,
- GSS_C_NO_CREDENTIAL,
- &input_token,
- gensec_gssapi_state->input_chan_bindings,
- &gensec_gssapi_state->client_name,
- &gss_oid_p,
- &output_token,
- &gensec_gssapi_state->got_flags,
- NULL,
- NULL);
- gensec_gssapi_state->gss_oid = gss_oid_p;
- break;
- }
- default:
- return NT_STATUS_INVALID_PARAMETER;
+ switch (gensec_security->gensec_role) {
+ case GENSEC_CLIENT:
+ {
+ uint8_t maxlength_proposed[4];
+ uint8_t security_supported;
+ int conf_state;
+ gss_qop_t qop_state;
+ input_token.length = in.length;
+ input_token.value = in.data;
+
+ maj_stat = gss_unwrap(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ &input_token,
+ &output_token,
+ &conf_state,
+ &qop_state);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
+ gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ if (output_token.length < 4) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ memcpy(maxlength_proposed, output_token.value, 4);
+ gss_release_buffer(&min_stat, &output_token);
- }
+ /* first byte is the proposed security */
+ security_supported = maxlength_proposed[0];
+ maxlength_proposed[0] = '\0';
+ gensec_gssapi_state->sasl_protection = 0;
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
+ if (security_supported & NEG_SEAL) {
+ gensec_gssapi_state->sasl_protection |= NEG_SEAL;
+ }
+ } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+ if (security_supported & NEG_SIGN) {
+ gensec_gssapi_state->sasl_protection |= NEG_SIGN;
+ }
+ } else if (security_supported & NEG_NONE) {
+ gensec_gssapi_state->sasl_protection |= NEG_NONE;
+ } else {
+ DEBUG(1, ("Remote server does not support unprotected connections"));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /* We just accept their max length, and send
+ * it back with the SASL flags */
+ maxlength_proposed[0] = gensec_gssapi_state->sasl_protection;
+
+ input_token.value = maxlength_proposed;
+ input_token.length = sizeof(maxlength_proposed);
+
+ maj_stat = gss_wrap(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ False,
+ GSS_C_QOP_DEFAULT,
+ &input_token,
+ &conf_state,
+ &output_token);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
+ gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
+ gss_release_buffer(&min_stat, &output_token);
- *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
- gss_release_buffer(&min_stat2, &output_token);
+ /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
+ gensec_gssapi_state->sasl_state = STAGE_DONE;
- if (maj_stat == GSS_S_COMPLETE) {
- return NT_STATUS_OK;
- } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
- } else {
- if (maj_stat == GSS_S_FAILURE
- && (min_stat == KRB5KRB_AP_ERR_BADVERSION || min_stat == KRB5KRB_AP_ERR_MSG_TYPE)) {
- /* garbage input, possibly from the auto-mech detection */
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
+ DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
+ } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+ DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
+ } else {
+ DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
+ }
+
+ return NT_STATUS_OK;
+ }
+ case GENSEC_SERVER:
+ {
+ uint8_t maxlength_proposed[4];
+ uint8_t security_supported = 0x0;
+ int conf_state;
+
+ /* TODO: Need some better ideas for this */
+ RSIVAL(maxlength_proposed, 0, 0xFFFFFF);
+ /* first byte is the proposed security */
+ maxlength_proposed[0] = '\0';
+
+ gensec_gssapi_state->sasl_protection = 0;
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
+ security_supported |= NEG_SEAL;
+ }
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+ security_supported |= NEG_SIGN;
+ }
+ if (security_supported == 0) {
+ /* If we don't support anything, this must be 0 */
+ RSIVAL(maxlength_proposed, 0, 0x0);
+ }
+
+ /* TODO: We may not wish to support this */
+ security_supported |= NEG_NONE;
+
+ /* Ignore 'in' */
+ maxlength_proposed[0] = security_supported;
+
+ input_token.value = maxlength_proposed;
+ input_token.length = sizeof(maxlength_proposed);
+
+ maj_stat = gss_wrap(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ False,
+ GSS_C_QOP_DEFAULT,
+ &input_token,
+ &conf_state,
+ &output_token);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
+ gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
+ gss_release_buffer(&min_stat, &output_token);
+
+ gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ }
+ default:
+ return NT_STATUS_INVALID_PARAMETER;
+
+ }
+ }
+ /* This is s server-only stage */
+ case STAGE_SASL_SSF_ACCEPT:
+ {
+ uint8_t maxlength_proposed[4];
+ uint8_t security_proposed;
+ int conf_state;
+ gss_qop_t qop_state;
+ input_token.length = in.length;
+ input_token.value = in.data;
+
+ maj_stat = gss_unwrap(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ &input_token,
+ &output_token,
+ &conf_state,
+ &qop_state);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
+ gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ if (output_token.length < 4) {
return NT_STATUS_INVALID_PARAMETER;
}
- DEBUG(1, ("GSS Update failed: %s\n",
- gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
- return nt_status;
+
+ memcpy(maxlength_proposed, output_token.value, 4);
+ gss_release_buffer(&min_stat, &output_token);
+
+ /* first byte is the proposed security */
+ /* TODO: We should do something with the rest, but for now... */
+ security_proposed = maxlength_proposed[0];
+
+ maxlength_proposed[0] = 0x0;
+ gensec_gssapi_state->sasl_protection = 0;
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
+ if (security_proposed & NEG_SEAL) {
+ gensec_gssapi_state->sasl_protection |= NEG_SEAL;
+ }
+ } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+ if (security_proposed & NEG_SIGN) {
+ gensec_gssapi_state->sasl_protection |= NEG_SIGN;
+ }
+ } else if (security_proposed & NEG_NONE) {
+ gensec_gssapi_state->sasl_protection |= NEG_NONE;
+ } else {
+ DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
+ gensec_gssapi_state->sasl_state = STAGE_DONE;
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
+ DEBUG(3, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
+ } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+ DEBUG(3, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
+ } else {
+ DEBUG(3, ("SASL/GSSAPI Connection from client will have no cryptographicly protection\n"));
+ }
+
+ *out = data_blob(NULL, 0);
+ return NT_STATUS_OK;
+ }
+ default:
+ return NT_STATUS_INVALID_PARAMETER;
}
}
&conf_state,
&output_token);
if (GSS_ERROR(maj_stat)) {
- DEBUG(1, ("GSS Wrap failed: %s\n",
+ DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat)));
return NT_STATUS_ACCESS_DENIED;
}
- *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
+ *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat, &output_token);
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
- DEBUG(1, ("GSS UnWrap failed: %s\n",
+ DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat)));
return NT_STATUS_ACCESS_DENIED;
}
- *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
+ *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat, &output_token);
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
return NT_STATUS_OK;
}
-static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security)
+/* Find out the size of the signature, assuming (incorrectly) that it
+ * GSSAPI provides any guarantees as to it's size.
+ *
+ * This is needed by the DCE/RPC code, which uses AEAD
+ * (signed headers, including signature legnth and a sealed body)
+ */
+static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
{
- /* not const but work for DCERPC packets and arcfour */
- return 45;
+ struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
+ OM_uint32 maj_stat, min_stat;
+ OM_uint32 output_size;
+ if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
+ || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
+ gensec_gssapi_state->gss_oid->length) != 0)) {
+ DEBUG(1, ("NO sig size available for this mech\n"));
+ return 0;
+ }
+
+ maj_stat = gsskrb5_wrap_size(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
+ GSS_C_QOP_DEFAULT,
+ data_size,
+ &output_size);
+ if (GSS_ERROR(maj_stat)) {
+ TALLOC_CTX *mem_ctx = talloc_new(NULL);
+ DEBUG(1, ("gensec_gssapi_seal_packet: determinaing signature size with gss_wrap_size_limit failed: %s\n",
+ gssapi_error_string(mem_ctx, maj_stat, min_stat)));
+ talloc_free(mem_ctx);
+ return 0;
+ }
+
+ if (output_size < data_size) {
+ return 0;
+ }
+
+ /* The difference between the max output and the max input must be the signature */
+ return output_size - data_size;
}
static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input_token, output_token;
int conf_state;
- ssize_t sig_length = 0;
+ ssize_t sig_length;
input_token.length = length;
input_token.value = data;
&conf_state,
&output_token);
if (GSS_ERROR(maj_stat)) {
- DEBUG(1, ("GSS Wrap failed: %s\n",
+ DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat)));
return NT_STATUS_ACCESS_DENIED;
}
- if (output_token.length < length) {
+ sig_length = gensec_gssapi_sig_size(gensec_security, length);
+
+ /* Caller must pad to right boundary */
+ if (output_token.length != (length + sig_length)) {
+ DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
+ (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
return NT_STATUS_INTERNAL_ERROR;
}
- sig_length = 45;
-
memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
*sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
gss_qop_t qop_state;
DATA_BLOB in;
- dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
+ dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
- DEBUG(1, ("GSS UnWrap failed: %s\n",
+ DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat)));
return NT_STATUS_ACCESS_DENIED;
}
return NT_STATUS_INTERNAL_ERROR;
}
- sig_length = 45;
+ sig_length = gensec_gssapi_sig_size(gensec_security, length);
+
+ /* Caller must pad to right boundary */
+ if (output_token.length != (length + sig_length)) {
+ DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
+ (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
+ return NT_STATUS_INTERNAL_ERROR;
+ }
- /*memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);*/
*sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
return NT_STATUS_OK;
}
+/* Try to figure out what features we actually got on the connection */
static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
uint32_t feature)
{
struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
if (feature & GENSEC_FEATURE_SIGN) {
+ /* If we are going GSSAPI SASL, then we honour the second negotiation */
+ if (gensec_gssapi_state->sasl
+ && gensec_gssapi_state->sasl_state == STAGE_DONE) {
+ return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
+ && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
+ }
return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
}
if (feature & GENSEC_FEATURE_SEAL) {
+ /* If we are going GSSAPI SASL, then we honour the second negotiation */
+ if (gensec_gssapi_state->sasl
+ && gensec_gssapi_state->sasl_state == STAGE_DONE) {
+ return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
+ && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
+ }
return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
}
if (feature & GENSEC_FEATURE_SESSION_KEY) {
-#ifdef HAVE_GSSKRB5_GET_INITIATOR_SUBKEY
+ /* Only for GSSAPI/Krb5 */
if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
&& (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements, gensec_gssapi_state->gss_oid->length) == 0)) {
return True;
}
-#endif
+ }
+ if (feature & GENSEC_FEATURE_DCE_STYLE) {
+ return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
+ }
+ /* We can always do async (rather than strict request/reply) packets. */
+ if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
+ return True;
}
return False;
}
+/*
+ * Extract the 'sesssion key' needed by SMB signing and ncacn_np
+ * (for encrypting some passwords).
+ *
+ * This breaks all the abstractions, but what do you expect...
+ */
static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
DATA_BLOB *session_key)
{
return NT_STATUS_OK;
}
-#ifdef HAVE_GSSKRB5_GET_INITIATOR_SUBKEY
- /* Ensure we only call this for GSSAPI/krb5, otherwise things could get very ugly */
+ /* Ensure we only call this for GSSAPI/krb5, otherwise things
+ * could get very ugly */
if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
&& (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
gensec_gssapi_state->gss_oid->length) == 0)) {
&skey);
if (maj_stat == 0) {
- DEBUG(10, ("Got KRB5 session key of length %d\n", skey.length));
+ DEBUG(10, ("Got KRB5 session key of length %d\n",
+ (int)skey.length));
gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
skey.value, skey.length);
*session_key = gensec_gssapi_state->session_key;
}
return NT_STATUS_NO_USER_SESSION_KEY;
}
-#endif
DEBUG(1, ("NO session key for this mech\n"));
return NT_STATUS_NO_USER_SESSION_KEY;
}
+
+/* Get some basic (and authorization) information about the user on
+ * this session. This uses either the PAC (if present) or a local
+ * database lookup */
static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
- struct auth_session_info **_session_info)
+ struct auth_session_info **_session_info)
{
NTSTATUS nt_status;
+ TALLOC_CTX *mem_ctx;
struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
struct auth_serversupplied_info *server_info = NULL;
struct auth_session_info *session_info = NULL;
- char *p;
- char *principal;
- const char *account_name;
- const char *realm;
+ struct PAC_LOGON_INFO *logon_info;
OM_uint32 maj_stat, min_stat;
gss_buffer_desc name_token;
+ gss_buffer_desc pac;
+ krb5_keyblock *keyblock;
+ time_t authtime;
+ krb5_principal principal;
+ char *principal_string;
+ DATA_BLOB pac_blob;
+ if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
+ || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
+ gensec_gssapi_state->gss_oid->length) != 0)) {
+ DEBUG(1, ("NO session info available for this mech\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
+ NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
+
maj_stat = gss_display_name (&min_stat,
gensec_gssapi_state->client_name,
&name_token,
NULL);
if (maj_stat) {
+ talloc_free(mem_ctx);
return NT_STATUS_FOOBAR;
}
- principal = talloc_strndup(gensec_gssapi_state, name_token.value, name_token.length);
+ principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
gss_release_buffer(&min_stat, &name_token);
- NT_STATUS_HAVE_NO_MEMORY(principal);
+ if (!principal_string) {
+ talloc_free(mem_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ maj_stat = gss_krb5_copy_service_keyblock(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ &keyblock);
- p = strchr(principal, '@');
- if (p) {
- *p = '\0';
- p++;
- realm = p;
- } else {
- realm = lp_realm();
+ if (maj_stat == 0) {
+ maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ &authtime);
+ }
+
+ if (maj_stat == 0) {
+ maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
+ gensec_gssapi_state->gssapi_context,
+ KRB5_AUTHDATA_WIN2K_PAC,
+ &pac);
}
- account_name = principal;
+ if (maj_stat == 0) {
+ pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
+ gss_release_buffer(&min_stat, &pac);
+ }
+
/* IF we have the PAC - otherwise we need to get this
* data from elsewere - local ldb, or (TODO) lookup of some
* kind...
- *
- * when heimdal can generate the PAC, we should fail if there's
- * no PAC present
*/
+ if (maj_stat == 0) {
+ krb5_error_code ret;
- {
- DATA_BLOB user_sess_key = data_blob(NULL, 0);
- DATA_BLOB lm_sess_key = data_blob(NULL, 0);
- /* TODO: should we pass the krb5 session key in here? */
- nt_status = sam_get_server_info(gensec_gssapi_state, account_name, realm,
- user_sess_key, lm_sess_key,
- &server_info);
- talloc_free(principal);
- NT_STATUS_NOT_OK_RETURN(nt_status);
+ ret = krb5_parse_name(gensec_gssapi_state->smb_krb5_context->krb5_context,
+ principal_string, &principal);
+ if (ret) {
+ talloc_free(mem_ctx);
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* decode and verify the pac */
+ nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
+ gensec_gssapi_state->smb_krb5_context->krb5_context,
+ NULL, keyblock, principal, authtime, NULL);
+ krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ union netr_Validation validation;
+ validation.sam3 = &logon_info->info3;
+ nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
+ NULL,
+ 3, &validation,
+ &server_info);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(mem_ctx);
+ return nt_status;
+ }
+ } else {
+ maj_stat = 1;
+ }
+ }
+
+ if (maj_stat) {
+ DEBUG(1, ("Unable to use PAC, resorting to local user lookup!\n"));
+ nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
+ &server_info);
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(mem_ctx);
+ return nt_status;
+ }
}
/* references the server_info into the session_info */
- nt_status = auth_generate_session_info(gensec_gssapi_state, server_info, &session_info);
- talloc_free(server_info);
- NT_STATUS_NOT_OK_RETURN(nt_status);
+ nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(mem_ctx);
+ return nt_status;
+ }
nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
- NT_STATUS_NOT_OK_RETURN(nt_status);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(mem_ctx);
+ return nt_status;
+ }
+ if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
+ DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
+ } else {
+ krb5_error_code ret;
+ DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
+ session_info->credentials = cli_credentials_init(session_info);
+ if (!session_info->credentials) {
+ talloc_free(mem_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ cli_credentials_set_conf(session_info->credentials);
+
+ ret = cli_credentials_set_client_gss_creds(session_info->credentials,
+ gensec_gssapi_state->delegated_cred_handle,
+ CRED_SPECIFIED);
+ if (ret) {
+ talloc_free(mem_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+ /* It has been taken from this place... */
+ gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
+ }
+ talloc_steal(gensec_gssapi_state, session_info);
+ talloc_free(mem_ctx);
*_session_info = session_info;
return NT_STATUS_OK;
}
-static const char *gensec_krb5_oids[] = {
+static const char *gensec_gssapi_krb5_oids[] = {
GENSEC_OID_KERBEROS5,
GENSEC_OID_KERBEROS5_OLD,
NULL
/* As a server, this could in theory accept any GSSAPI mech */
static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
.name = "gssapi_krb5",
- .oid = gensec_krb5_oids,
+ .auth_type = DCERPC_AUTH_TYPE_KRB5,
+ .oid = gensec_gssapi_krb5_oids,
.client_start = gensec_gssapi_client_start,
.server_start = gensec_gssapi_server_start,
+ .magic = gensec_gssapi_magic,
.update = gensec_gssapi_update,
.session_key = gensec_gssapi_session_key,
.session_info = gensec_gssapi_session_info,
.wrap = gensec_gssapi_wrap,
.unwrap = gensec_gssapi_unwrap,
.have_feature = gensec_gssapi_have_feature,
- .enabled = False
+ .enabled = True,
+ .kerberos = True
+};
+
+/* As a server, this could in theory accept any GSSAPI mech */
+static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
+ .name = "gssapi_krb5_sasl",
+ .sasl_name = "GSSAPI",
+ .client_start = gensec_gssapi_sasl_client_start,
+ .server_start = gensec_gssapi_sasl_server_start,
+ .update = gensec_gssapi_update,
+ .session_key = gensec_gssapi_session_key,
+ .session_info = gensec_gssapi_session_info,
+ .wrap = gensec_gssapi_wrap,
+ .unwrap = gensec_gssapi_unwrap,
+ .have_feature = gensec_gssapi_have_feature,
+ .enabled = True,
+ .kerberos = True
};
NTSTATUS gensec_gssapi_init(void)
return ret;
}
+ ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
+ if (!NT_STATUS_IS_OK(ret)) {
+ DEBUG(0,("Failed to register '%s' gensec backend!\n",
+ gensec_gssapi_sasl_krb5_security_ops.name));
+ return ret;
+ }
+
return ret;
}
git.samba.org / samba.git / blobdiff