summaryrefslogtreecommitdiff
path: root/regress/unittests/kex/test_kex.c
blob: e906477639d9a81c4a6e3f6c8503cd628c7e2c82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
/* 	$OpenBSD: test_kex.c,v 1.1 2015/01/15 23:41:29 markus Exp $ */
/*
 * Regress test KEX
 *
 * Placed in the public domain
 */

#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "test_helper.h"

#include "ssherr.h"
#include "ssh_api.h"
#include "sshbuf.h"
#include "packet.h"
#include "myproposal.h"

void kex_tests(void);
static int do_debug = 0;

static int
do_send_and_receive(struct ssh *from, struct ssh *to)
{
	u_char type;
	size_t len;
	const u_char *buf;
	int r;

	for (;;) {
		if ((r = ssh_packet_next(from, &type)) != 0) {
			fprintf(stderr, "ssh_packet_next: %s\n", ssh_err(r));
			return r;
		}
		if (type != 0)
			return 0;
		buf = ssh_output_ptr(from, &len);
		if (do_debug)
			printf("%zu", len);
		if (len == 0)
			return 0;
		if ((r = ssh_output_consume(from, len)) != 0 ||
		    (r = ssh_input_append(to, buf, len)) != 0)
			return r;
	}
}

static void
run_kex(struct ssh *client, struct ssh *server)
{
	int r = 0;

	while (!server->kex->done || !client->kex->done) {
		if (do_debug)
			printf(" S:");
		if ((r = do_send_and_receive(server, client)))
			break;
		if (do_debug)
			printf(" C:");
		if ((r = do_send_and_receive(client, server)))
			break;
	}
	if (do_debug)
		printf("done: %s\n", ssh_err(r));
	ASSERT_INT_EQ(r, 0);
	ASSERT_INT_EQ(server->kex->done, 1);
	ASSERT_INT_EQ(client->kex->done, 1);
}

static void
do_kex_with_key(char *kex, int keytype, int bits)
{
	struct ssh *client = NULL, *server = NULL, *server2 = NULL;
	struct sshkey *private, *public;
	struct sshbuf *state;
	struct kex_params kex_params;
	char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };

	TEST_START("sshkey_generate");
	ASSERT_INT_EQ(sshkey_generate(keytype, bits, &private), 0);
	TEST_DONE();

	TEST_START("sshkey_from_private");
	ASSERT_INT_EQ(sshkey_from_private(private, &public), 0);
	TEST_DONE();

	TEST_START("ssh_init");
	memcpy(kex_params.proposal, myproposal, sizeof(myproposal));
	if (kex != NULL)
		kex_params.proposal[PROPOSAL_KEX_ALGS] = kex;
	ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0);
	ASSERT_INT_EQ(ssh_init(&server, 1, &kex_params), 0);
	ASSERT_PTR_NE(client, NULL);
	ASSERT_PTR_NE(server, NULL);
	TEST_DONE();

	TEST_START("ssh_add_hostkey");
	ASSERT_INT_EQ(ssh_add_hostkey(server, private), 0);
	ASSERT_INT_EQ(ssh_add_hostkey(client, public), 0);
	TEST_DONE();

	TEST_START("kex");
	run_kex(client, server);
	TEST_DONE();

	TEST_START("rekeying client");
	ASSERT_INT_EQ(kex_send_kexinit(client), 0);
	run_kex(client, server);
	TEST_DONE();

	TEST_START("rekeying server");
	ASSERT_INT_EQ(kex_send_kexinit(server), 0);
	run_kex(client, server);
	TEST_DONE();

	TEST_START("ssh_packet_get_state");
	state = sshbuf_new();
	ASSERT_PTR_NE(state, NULL);
	ASSERT_INT_EQ(ssh_packet_get_state(server, state), 0);
	ASSERT_INT_GE(sshbuf_len(state), 1);
	TEST_DONE();

	TEST_START("ssh_packet_set_state");
	server2 = NULL;
	ASSERT_INT_EQ(ssh_init(&server2, 1, NULL), 0);
	ASSERT_PTR_NE(server2, NULL);
	ASSERT_INT_EQ(ssh_add_hostkey(server2, private), 0);
	kex_free(server2->kex);	/* XXX or should ssh_packet_set_state()? */
	ASSERT_INT_EQ(ssh_packet_set_state(server2, state), 0);
	ASSERT_INT_EQ(sshbuf_len(state), 0);
	sshbuf_free(state);
	ASSERT_PTR_NE(server2->kex, NULL);
	/* XXX we need to set the callbacks */
	server2->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
	server2->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
	server2->kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
	server2->kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
	server2->kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
	server2->kex->kex[KEX_C25519_SHA256] = kexc25519_server;
	server2->kex->load_host_public_key = server->kex->load_host_public_key;
	server2->kex->load_host_private_key = server->kex->load_host_private_key;
	server2->kex->sign = server->kex->sign;
	TEST_DONE();

	TEST_START("rekeying server2");
	ASSERT_INT_EQ(kex_send_kexinit(server2), 0);
	run_kex(client, server2);
	ASSERT_INT_EQ(kex_send_kexinit(client), 0);
	run_kex(client, server2);
	TEST_DONE();

	TEST_START("cleanup");
	sshkey_free(private);
	sshkey_free(public);
	ssh_free(client);
	ssh_free(server);
	ssh_free(server2);
	TEST_DONE();
}

static void
do_kex(char *kex)
{
	do_kex_with_key(kex, KEY_RSA, 2048);
	do_kex_with_key(kex, KEY_DSA, 1024);
	do_kex_with_key(kex, KEY_ECDSA, 256);
	do_kex_with_key(kex, KEY_ED25519, 256);
}

void
kex_tests(void)
{
	do_kex("curve25519-sha256@libssh.org");
	do_kex("ecdh-sha2-nistp256");
	do_kex("ecdh-sha2-nistp384");
	do_kex("ecdh-sha2-nistp521");
	do_kex("diffie-hellman-group-exchange-sha256");
	do_kex("diffie-hellman-group-exchange-sha1");
	do_kex("diffie-hellman-group14-sha1");
	do_kex("diffie-hellman-group1-sha1");
}