--- /dev/null
+#include "mod_auth_gssapi.h"
+
+static const char *
+get_gss_error(request_rec *r, OM_uint32 err_maj, OM_uint32 err_min, char *prefix)
+{
+ OM_uint32 maj_stat, min_stat;
+ OM_uint32 msg_ctx = 0;
+ gss_buffer_desc status_string;
+ char *err_msg;
+ int first_pass;
+
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "GSS-API major_status:%8.8x, minor_status:%8.8x",
+ err_maj, err_min);
+
+ err_msg = apr_pstrdup(r->pool, prefix);
+ do {
+ maj_stat = gss_display_status (&min_stat,
+ err_maj,
+ GSS_C_GSS_CODE,
+ GSS_C_NO_OID,
+ &msg_ctx,
+ &status_string);
+ if (!GSS_ERROR(maj_stat)) {
+ err_msg = apr_pstrcat(r->pool, err_msg,
+ ": ", (char*) status_string.value, NULL);
+ gss_release_buffer(&min_stat, &status_string);
+ first_pass = 0;
+ }
+ } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
+
+ msg_ctx = 0;
+ err_msg = apr_pstrcat(r->pool, err_msg, " (", NULL);
+ first_pass = 1;
+ do {
+ maj_stat = gss_display_status (&min_stat,
+ err_min,
+ GSS_C_MECH_CODE,
+ GSS_C_NULL_OID,
+ &msg_ctx,
+ &status_string);
+ if (!GSS_ERROR(maj_stat)) {
+ err_msg = apr_pstrcat(r->pool, err_msg,
+ (first_pass) ? "" : ", ",
+ (char *) status_string.value,
+ NULL);
+ gss_release_buffer(&min_stat, &status_string);
+ first_pass = 0;
+ }
+ } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
+ err_msg = apr_pstrcat(r->pool, err_msg, ")", NULL);
+
+ return err_msg;
+}
+
+static int
+get_gss_creds(request_rec *r,
+ gss_auth_config *conf,
+ gss_cred_id_t *server_creds)
+{
+ gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
+ OM_uint32 major_status, minor_status, minor_status2;
+ gss_name_t server_name = GSS_C_NO_NAME;
+ char buf[1024];
+ int have_server_princ;
+
+ if (conf->service_name && strcmp(conf->service_name, "Any") == 0) {
+ *server_creds = GSS_C_NO_CREDENTIAL;
+ return 0;
+ }
+
+ have_server_princ = conf->service_name && strchr(conf->service_name, '/') != NULL;
+ if (have_server_princ)
+ strncpy(buf, conf->service_name, sizeof(buf));
+ else
+ snprintf(buf, sizeof(buf), "%s@%s",
+ (conf->service_name) ? conf->service_name : SERVICE_NAME,
+ ap_get_server_name(r));
+
+ token.value = buf;
+ token.length = strlen(buf) + 1;
+
+ major_status = gss_import_name(&minor_status, &token,
+ (have_server_princ) ? (gss_OID) GSS_KRB5_NT_PRINCIPAL_NAME : (gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
+ &server_name);
+ memset(&token, 0, sizeof(token));
+ if (GSS_ERROR(major_status)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status,
+ "gss_import_name() failed"));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ major_status = gss_display_name(&minor_status, server_name, &token, NULL);
+ if (GSS_ERROR(major_status)) {
+ /* Perhaps we could just ignore this error but it's safer to give up now,
+ I think */
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status,
+ "gss_display_name() failed"));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "Acquiring creds for %s", token.value);
+ gss_release_buffer(&minor_status, &token);
+
+ major_status = gss_acquire_cred(&minor_status, server_name, GSS_C_INDEFINITE,
+ GSS_C_NO_OID_SET, GSS_C_ACCEPT,
+ server_creds, NULL, NULL);
+ gss_release_name(&minor_status2, &server_name);
+ if (GSS_ERROR(major_status)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status,
+ "Failed to load GSS-API credentials"));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ return 0;
+}
+
+static int
+cmp_gss_type(gss_buffer_t token, gss_OID oid)
+{
+ unsigned char *p;
+ size_t len;
+
+ if (token->length == 0)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ p = token->value;
+ if (*p++ != 0x60)
+ return GSS_S_DEFECTIVE_TOKEN;
+ len = *p++;
+ if (len & 0x80) {
+ if ((len & 0x7f) > 4)
+ return GSS_S_DEFECTIVE_TOKEN;
+ p += len & 0x7f;
+ }
+ if (*p++ != 0x06)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ if (((OM_uint32) *p++) != oid->length)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ return memcmp(p, oid->elements, oid->length);
+}
+
+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
+ }
+
+ ret = get_gss_creds(r, conf, &server_creds);
+ if (ret)
+ goto end;
+
+ /* 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)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status,
+ "Failed to establish authentication"));
+ /* 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;
+ 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);
+ 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;
+ ctx->user = apr_pstrdup(r->pool, output_token.value);
+ 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;
+}
projects / mod_auth_kerb.git / blobdiff