Annotation of embedaddon/strongswan/src/conftest/hooks/ike_auth_fill.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2010 Martin Willi
3: * Copyright (C) 2010 revosec AG
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include "hook.h"
17:
18: #include <time.h>
19: #include <netinet/udp.h>
20:
21: #include <encoding/payloads/cert_payload.h>
22: #include <encoding/payloads/encrypted_payload.h>
23:
24: typedef struct private_ike_auth_fill_t private_ike_auth_fill_t;
25:
26: /**
27: * Private data of an ike_auth_fill_t object.
28: */
29: struct private_ike_auth_fill_t {
30:
31: /**
32: * Implements the hook_t interface.
33: */
34: hook_t hook;
35:
36: /**
37: * Alter requests or responses?
38: */
39: bool req;
40:
41: /**
42: * ID of message to alter.
43: */
44: int id;
45:
46: /**
47: * Number of bytes to fill IKE_AUTH up
48: */
49: int bytes;
50: };
51:
52: /** size of non ESP-Marker */
53: #define NON_ESP_MARKER_LEN 4
54: /** length of fixed encryption payload header */
55: #define ENCRYPTION_PAYLOAD_HEADER_LENGTH 4
56: /** length of fixed cert payload header */
57: #define CERT_PAYLOAD_HEADER_LENGTH 5
58: /**
59: * Calculate packet size on wire (without ethernet/IP header)
60: */
61: static size_t calculate_wire_size(message_t *message, ike_sa_t *ike_sa)
62: {
63: enumerator_t *enumerator;
64: payload_t *payload;
65: size_t size = 0;
66:
67: enumerator = message->create_payload_enumerator(message);
68: while (enumerator->enumerate(enumerator, &payload))
69: {
70: size += payload->get_length(payload);
71: }
72: enumerator->destroy(enumerator);
73:
74: if (message->get_exchange_type(message) != IKE_SA_INIT)
75: {
76: keymat_t *keymat;
77: aead_t *aead;
78: size_t bs;
79:
80: keymat = ike_sa->get_keymat(ike_sa);
81: aead = keymat->get_aead(keymat, FALSE);
82: if (aead)
83: {
84: bs = aead->get_block_size(aead);
85: size += ENCRYPTION_PAYLOAD_HEADER_LENGTH + NON_ESP_MARKER_LEN +
86: aead->get_icv_size(aead) + aead->get_iv_size(aead) +
87: (bs - (size % bs));
88: }
89: }
90: return sizeof(struct udphdr) + IKE_HEADER_LENGTH + size;
91: }
92:
93: METHOD(listener_t, message, bool,
94: private_ike_auth_fill_t *this, ike_sa_t *ike_sa, message_t *message,
95: bool incoming, bool plain)
96: {
97: if (!incoming && plain &&
98: message->get_request(message) == this->req &&
99: message->get_message_id(message) == this->id)
100: {
101: cert_payload_t *pld;
102: size_t size, diff;
103: chunk_t data;
104:
105: size = calculate_wire_size(message, ike_sa);
106: if (size < this->bytes - CERT_PAYLOAD_HEADER_LENGTH)
107: {
108: diff = this->bytes - size - CERT_PAYLOAD_HEADER_LENGTH;
109: data = chunk_alloc(diff);
110: memset(data.ptr, 0x12, data.len);
111: pld = cert_payload_create_custom(PLV2_CERTIFICATE, 201, data);
112: message->add_payload(message, &pld->payload_interface);
113: DBG1(DBG_CFG, "inserting %d dummy bytes certificate payload", diff);
114: }
115: }
116: return TRUE;
117: }
118:
119: METHOD(hook_t, destroy, void,
120: private_ike_auth_fill_t *this)
121: {
122: free(this);
123: }
124:
125: /**
126: * Create the IKE_AUTH fill hook
127: */
128: hook_t *ike_auth_fill_hook_create(char *name)
129: {
130: private_ike_auth_fill_t *this;
131:
132: INIT(this,
133: .hook = {
134: .listener = {
135: .message = _message,
136: },
137: .destroy = _destroy,
138: },
139: .req = conftest->test->get_bool(conftest->test,
140: "hooks.%s.request", TRUE, name),
141: .id = conftest->test->get_int(conftest->test,
142: "hooks.%s.id", 1, name),
143: .bytes = conftest->test->get_int(conftest->test,
144: "hooks.%s.bytes", 0, name),
145: );
146:
147: return &this->hook;
148: }
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