Added a hook to modify proposal numbers
authorMartin Willi <martin@revosec.ch>
Mon, 15 Nov 2010 13:37:02 +0000 (14:37 +0100)
committerMartin Willi <martin@revosec.ch>
Wed, 5 Jan 2011 15:45:47 +0000 (16:45 +0100)
src/conftest/Makefile.am
src/conftest/hooks/set_proposal_number.c [new file with mode: 0644]

index 738dd6b..7eecfc6 100644 (file)
@@ -7,7 +7,7 @@ conftest_SOURCES = conftest.c conftest.h config.c config.h actions.c actions.h \
        hooks/add_notify.c hooks/unencrypted_notify.c hooks/ignore_message.c \
        hooks/add_payload.c hooks/set_critical.c hooks/force_cookie.c \
        hooks/set_ike_version.c hooks/pretend_auth.c hooks/set_length.c \
-       hooks/log_proposals.c
+       hooks/log_proposals.c hooks/set_proposal_number.c
 
 INCLUDES = \
        -I$(top_srcdir)/src/libstrongswan \
diff --git a/src/conftest/hooks/set_proposal_number.c b/src/conftest/hooks/set_proposal_number.c
new file mode 100644 (file)
index 0000000..a59d96b
--- /dev/null
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "hook.h"
+
+#include <encoding/payloads/sa_payload.h>
+
+typedef struct private_set_proposal_number_t private_set_proposal_number_t;
+
+/**
+ * Private data of an set_proposal_number_t object.
+ */
+struct private_set_proposal_number_t {
+
+       /**
+        * Implements the hook_t interface.
+        */
+       hook_t hook;
+
+       /**
+        * Alter requests or responses?
+        */
+       bool req;
+
+       /**
+        * ID of message to alter.
+        */
+       int id;
+
+       /**
+        * Proposal number to modify
+        */
+       int from;
+
+       /**
+        * Proposal number to set
+        */
+       int to;
+};
+
+/**
+ * Copy all algs from given type from one proposal to another
+ */
+static void copy_proposal_algs(proposal_t *from, proposal_t *to,
+                                                          transform_type_t type)
+{
+       enumerator_t *enumerator;
+       u_int16_t alg, key_size;
+
+       enumerator = from->create_enumerator(from, type);
+       while (enumerator->enumerate(enumerator, &alg, &key_size))
+       {
+               to->add_algorithm(to, type, alg, key_size);
+       }
+       enumerator->destroy(enumerator);
+}
+
+METHOD(listener_t, message, bool,
+       private_set_proposal_number_t *this, ike_sa_t *ike_sa, message_t *message,
+       bool incoming)
+{
+       if (!incoming &&
+               message->get_request(message) == this->req &&
+               message->get_message_id(message) == this->id)
+       {
+               enumerator_t *enumerator;
+               payload_t *payload;
+               linked_list_t *list = NULL, *updated;
+               sa_payload_t *sa;
+               proposal_t *proposal, *new;
+
+               updated = linked_list_create();
+               enumerator = message->create_payload_enumerator(message);
+               while (enumerator->enumerate(enumerator, &payload))
+               {
+                       if (payload->get_type(payload) == SECURITY_ASSOCIATION)
+                       {
+                               sa = (sa_payload_t*)payload;
+                               list = sa->get_proposals(sa);
+                               message->remove_payload_at(message, enumerator);
+                               sa->destroy(sa);
+                       }
+               }
+               enumerator->destroy(enumerator);
+
+               if (list)
+               {
+                       enumerator = list->create_enumerator(list);
+                       while (enumerator->enumerate(enumerator, &proposal))
+                       {
+                               if (proposal->get_number(proposal) == this->from)
+                               {
+                                       DBG1(DBG_CFG, "setting proposal number from %d to %d",
+                                                this->from, this->to);
+                                       new = proposal_create(proposal->get_protocol(proposal),
+                                                                                 this->to);
+                                       copy_proposal_algs(proposal, new, ENCRYPTION_ALGORITHM);
+                                       copy_proposal_algs(proposal, new, INTEGRITY_ALGORITHM);
+                                       copy_proposal_algs(proposal, new, PSEUDO_RANDOM_FUNCTION);
+                                       copy_proposal_algs(proposal, new, DIFFIE_HELLMAN_GROUP);
+                                       copy_proposal_algs(proposal, new, EXTENDED_SEQUENCE_NUMBERS);
+                                       updated->insert_last(updated, new);
+                               }
+                               else
+                               {
+                                       list->remove_at(list, enumerator);
+                                       updated->insert_last(updated, proposal);
+                               }
+                       }
+                       enumerator->destroy(enumerator);
+               }
+               sa = sa_payload_create_from_proposal_list(updated);
+               list->destroy_offset(list, offsetof(proposal_t, destroy));
+               updated->destroy_offset(updated, offsetof(proposal_t, destroy));
+               message->add_payload(message, (payload_t*)sa);
+       }
+       return TRUE;
+}
+
+METHOD(hook_t, destroy, void,
+       private_set_proposal_number_t *this)
+{
+       free(this);
+}
+
+/**
+ * Create the IKE_AUTH fill hook
+ */
+hook_t *set_proposal_number_hook_create(char *name)
+{
+       private_set_proposal_number_t *this;
+
+       INIT(this,
+               .hook = {
+                       .listener = {
+                               .message = _message,
+                       },
+                       .destroy = _destroy,
+               },
+               .req = conftest->test->get_bool(conftest->test,
+                                                                               "hooks.%s.request", TRUE, name),
+               .id = conftest->test->get_int(conftest->test,
+                                                                               "hooks.%s.id", 0, name),
+               .from = conftest->test->get_int(conftest->test,
+                                                                               "hooks.%s.from", 0, name),
+               .to = conftest->test->get_int(conftest->test,
+                                                                               "hooks.%s.to", 1, name),
+       );
+
+       return &this->hook;
+}