command("GSSKrb5Keytab", ap_set_string_slot, krb5_keytab,
TAKE1, "Location of Kerberos V5 keytab file."),
+ AP_INIT_RAW_ARGS("GssapiNameAttributes", mag_name_attrs, NULL, OR_AUTHCFG | RSRC_CONF,
+ "Name Attributes to be exported as environ variables"),
{ NULL }
};
}
static int
+gss_authenticate(request_rec *r, gss_auth_config *conf, gss_conn_ctx ctx,
+ const char *auth_line, char **negotiate_ret_value)
+{
+ OM_uint32 major_status, minor_status, minor_status2;
+ gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
+ const char *auth_param = NULL;
+ int ret;
+ gss_name_t client_name = GSS_C_NO_NAME;
+ gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
+ gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
+ OM_uint32 ret_flags = 0;
+ gss_OID_desc spnego_oid;
+ OM_uint32 (*accept_sec_context)
+ (OM_uint32 *, gss_ctx_id_t *, const gss_cred_id_t,
+ const gss_buffer_t, const gss_channel_bindings_t,
+ gss_name_t *, gss_OID *, gss_buffer_t, OM_uint32 *,
+ OM_uint32 *, gss_cred_id_t *);
+
+ *negotiate_ret_value = "\0";
+
+ spnego_oid.length = 6;
+ spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
+
+ if (conf->krb5_keytab) {
+ char *ktname;
+ /* we don't use the ap_* calls here, since the string passed to putenv()
+ * will become part of the enviroment and shouldn't be free()ed by apache
+ */
+ ktname = malloc(strlen("KRB5_KTNAME=") + strlen(conf->krb5_keytab) + 1);
+ if (ktname == NULL) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "malloc() failed: not enough memory");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+ sprintf(ktname, "KRB5_KTNAME=%s", conf->krb5_keytab);
+ putenv(ktname);
+#ifdef HEIMDAL
+ /* Seems to be also supported by latest MIT */
+ gsskrb5_register_acceptor_identity(conf->krb_5_keytab);
+#endif
+ }
+
+ /* ap_getword() shifts parameter */
+ auth_param = ap_getword_white(r->pool, &auth_line);
+ if (auth_param == NULL) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "No Authorization parameter in request from client");
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ if (ctx->state == GSS_CTX_ESTABLISHED) {
+ gss_delete_sec_context(&minor_status, &ctx->context, GSS_C_NO_BUFFER);
+ ctx->context = GSS_C_NO_CONTEXT;
+ ctx->state = GSS_CTX_EMPTY;
+ }
+
+ input_token.length = apr_base64_decode_len(auth_param) + 1;
+ input_token.value = apr_pcalloc(r->connection->pool, input_token.length);
+ if (input_token.value == NULL) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "ap_pcalloc() failed (not enough memory)");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+ input_token.length = apr_base64_decode(input_token.value, auth_param);
+
+ /* LOG length, type */
+
+#ifdef GSSAPI_SUPPORTS_SPNEGO
+ accept_sec_context = gss_accept_sec_context;
+#else
+ accept_sec_context = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
+ gss_accept_sec_context_spnego : gss_accept_sec_context;
+#endif
+
+ major_status = accept_sec_context(&minor_status,
+ &ctx->context,
+ server_creds,
+ &input_token,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ NULL,
+ NULL,
+ &output_token,
+ &ret_flags,
+ NULL,
+ &delegated_cred);
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "Client %s us their credential",
+ (ret_flags & GSS_C_DELEG_FLAG) ? "delegated" : "didn't delegate");
+ if (output_token.length) {
+ char *token = NULL;
+ size_t len;
+
+ len = apr_base64_encode_len(output_token.length) + 1;
+ token = apr_pcalloc(r->connection->pool, len + 1);
+ if (token == NULL) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "ap_pcalloc() failed (not enough memory)");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ gss_release_buffer(&minor_status2, &output_token);
+ goto end;
+ }
+ apr_base64_encode(token, output_token.value, output_token.length);
+ token[len] = '\0';
+ *negotiate_ret_value = token;
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "GSS-API token of length %d bytes will be sent back",
+ output_token.length);
+ gss_release_buffer(&minor_status2, &output_token);
+ }
+
+ if (GSS_ERROR(major_status)) {
+ // at least this error should be populated, to provider further information
+ // to the user (maybe)
+ char *error = get_gss_error(r, major_status, minor_status, "Failed to establish authentication");
+ apr_table_set(r->subprocess_env, "GSS_ERROR_STR", error);
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, error);
+#if 0
+ /* Don't offer the Negotiate method again if call to GSS layer failed */
+ /* XXX ... which means we don't return the "error" output */
+ *negotiate_ret_value = NULL;
+#endif
+ gss_delete_sec_context(&minor_status, &ctx->context, GSS_C_NO_BUFFER);
+ ctx->context = GSS_C_NO_CONTEXT;
+ ctx->state = GSS_CTX_EMPTY;
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ if (major_status & GSS_S_CONTINUE_NEEDED) {
+ ctx->state = GSS_CTX_IN_PROGRESS;
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ major_status = gss_inquire_context(&minor_status, ctx->context, &client_name,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (GSS_ERROR(major_status)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status, "gss_inquire_context() failed"));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+
+ major_status = gss_display_name(&minor_status, client_name, &output_token, NULL);
+ ctx->user = apr_pstrndup(r->pool, output_token.value, output_token.length);
+
+ if (conf->name_attributes) {
+ mag_get_name_attributes(r, conf, client_name, ctx);
+ mag_set_req_data(r, conf, ctx);
+ }
+
+
+ gss_release_name(&minor_status, &client_name);
+ if (GSS_ERROR(major_status)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status,
+ "gss_display_name() failed"));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+
+ ctx->state = GSS_CTX_ESTABLISHED;
+ gss_release_buffer(&minor_status, &output_token);
+
+ ret = OK;
+
+end:
+ if (delegated_cred)
+ gss_release_cred(&minor_status, &delegated_cred);
+
+ if (output_token.length)
+ gss_release_buffer(&minor_status, &output_token);
+
+ if (client_name != GSS_C_NO_NAME)
+ gss_release_name(&minor_status, &client_name);
+
+ if (server_creds != GSS_C_NO_CREDENTIAL)
+ gss_release_cred(&minor_status, &server_creds);
+
+ return ret;
+}
+
+static int mag_post_config(apr_pool_t *cfgpool, apr_pool_t *log,
+ apr_pool_t *temp, server_rec *s)
+{
+ ap_add_version_component(cfgpool, "Moonshot mod_auth_gssapi");
+ return OK;
+}
+
+#define MAG_ERROR_NO_AUTH_DATA "NO_AUTH_DATA"
+#define MAG_ERROR_UNSUP_AUTH_TYPE "UNSUP_AUTH_TYPE"
+#define MAG_ERROR_GSS_MECH "GSS_MECH_ERROR"
+
+static int
gss_authenticate_user(request_rec *r)
{
- gss_auth_config *conf =
+ gss_auth_config *conf =
(gss_auth_config *) ap_get_module_config(r->per_dir_config,
&auth_gssapi_module);
const char *auth_line = NULL;
int ret;
gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "Entering GSSAPI authentication");
-
+
/* get the type specified in Apache configuration */
type = ap_auth_type(r);
if (type == NULL || strcmp(type, "Negotiate") != 0) {
gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
"Client hasn't sent any authentication data, giving up");
set_http_headers(r, conf, "\0");
+ apr_table_set(r->subprocess_env, "MAG_ERROR", MAG_ERROR_NO_AUTH_DATA);
return HTTP_UNAUTHORIZED;
}
"Unsupported authentication type (%s) requested by client",
(auth_type) ? auth_type : "(NULL)");
set_http_headers(r, conf, "\0");
+ apr_table_set(r->subprocess_env, "MAG_ERROR", MAG_ERROR_UNSUP_AUTH_TYPE);
return HTTP_UNAUTHORIZED;
}
- conn_ctx = gss_get_conn_ctx(r);
- if (conn_ctx == NULL) {
+ if ((NULL == (conn_ctx = gss_retrieve_conn_ctx(r))) &&
+ (NULL == (conn_ctx = gss_create_conn_ctx(r, conf)))) {
gss_log(APLOG_MARK, APLOG_ERR, 0, r,
"Failed to create internal context: probably not enough memory");
return HTTP_INTERNAL_SERVER_ERROR;
if (ret == OK) {
r->user = apr_pstrdup(r->pool, conn_ctx->user);
r->ap_auth_type = "Negotiate";
+ } else {
+ apr_table_set(r->subprocess_env, "MAG_ERROR", MAG_ERROR_GSS_MECH);
}
-
/* debug LOG ??? */
return ret;
gss_register_hooks(apr_pool_t *p)
{
ap_hook_check_user_id(gss_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_post_config(mag_post_config, NULL, NULL, APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA auth_gssapi_module = {
projects / mod_auth_kerb.git / blobdiff