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1 /* 	$OpenBSD: test_kex.c,v 1.2 2015/07/10 06:23:25 markus Exp $ */
2 /*
3  * Regress test KEX
4  *
5  * Placed in the public domain
6  */
7 
8 #include "includes.h"
9 
10 #include <sys/types.h>
11 #include <sys/param.h>
12 #include <stdio.h>
13 #ifdef HAVE_STDINT_H
14 #include <stdint.h>
15 #endif
16 #include <stdlib.h>
17 #include <string.h>
18 
19 #include "../test_helper/test_helper.h"
20 
21 #include "ssherr.h"
22 #include "ssh_api.h"
23 #include "sshbuf.h"
24 #include "packet.h"
25 #include "myproposal.h"
26 
27 struct ssh *active_state = NULL; /* XXX - needed for linking */
28 
29 void kex_tests(void);
30 static int do_debug = 0;
31 
32 static int
do_send_and_receive(struct ssh * from,struct ssh * to)33 do_send_and_receive(struct ssh *from, struct ssh *to)
34 {
35 	u_char type;
36 	size_t len;
37 	const u_char *buf;
38 	int r;
39 
40 	for (;;) {
41 		if ((r = ssh_packet_next(from, &type)) != 0) {
42 			fprintf(stderr, "ssh_packet_next: %s\n", ssh_err(r));
43 			return r;
44 		}
45 		if (type != 0)
46 			return 0;
47 		buf = ssh_output_ptr(from, &len);
48 		if (do_debug)
49 			printf("%zu", len);
50 		if (len == 0)
51 			return 0;
52 		if ((r = ssh_output_consume(from, len)) != 0 ||
53 		    (r = ssh_input_append(to, buf, len)) != 0)
54 			return r;
55 	}
56 }
57 
58 static void
run_kex(struct ssh * client,struct ssh * server)59 run_kex(struct ssh *client, struct ssh *server)
60 {
61 	int r = 0;
62 
63 	while (!server->kex->done || !client->kex->done) {
64 		if (do_debug)
65 			printf(" S:");
66 		if ((r = do_send_and_receive(server, client)))
67 			break;
68 		if (do_debug)
69 			printf(" C:");
70 		if ((r = do_send_and_receive(client, server)))
71 			break;
72 	}
73 	if (do_debug)
74 		printf("done: %s\n", ssh_err(r));
75 	ASSERT_INT_EQ(r, 0);
76 	ASSERT_INT_EQ(server->kex->done, 1);
77 	ASSERT_INT_EQ(client->kex->done, 1);
78 }
79 
80 static void
do_kex_with_key(char * kex,int keytype,int bits)81 do_kex_with_key(char *kex, int keytype, int bits)
82 {
83 	struct ssh *client = NULL, *server = NULL, *server2 = NULL;
84 	struct sshkey *private, *public;
85 	struct sshbuf *state;
86 	struct kex_params kex_params;
87 	char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
88 	char *keyname = NULL;
89 
90 	TEST_START("sshkey_generate");
91 	ASSERT_INT_EQ(sshkey_generate(keytype, bits, &private), 0);
92 	TEST_DONE();
93 
94 	TEST_START("sshkey_from_private");
95 	ASSERT_INT_EQ(sshkey_from_private(private, &public), 0);
96 	TEST_DONE();
97 
98 	TEST_START("ssh_init");
99 	memcpy(kex_params.proposal, myproposal, sizeof(myproposal));
100 	if (kex != NULL)
101 		kex_params.proposal[PROPOSAL_KEX_ALGS] = kex;
102 	keyname = strdup(sshkey_ssh_name(private));
103 	ASSERT_PTR_NE(keyname, NULL);
104 	kex_params.proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = keyname;
105 	ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0);
106 	ASSERT_INT_EQ(ssh_init(&server, 1, &kex_params), 0);
107 	ASSERT_PTR_NE(client, NULL);
108 	ASSERT_PTR_NE(server, NULL);
109 	TEST_DONE();
110 
111 	TEST_START("ssh_add_hostkey");
112 	ASSERT_INT_EQ(ssh_add_hostkey(server, private), 0);
113 	ASSERT_INT_EQ(ssh_add_hostkey(client, public), 0);
114 	TEST_DONE();
115 
116 	TEST_START("kex");
117 	run_kex(client, server);
118 	TEST_DONE();
119 
120 	TEST_START("rekeying client");
121 	ASSERT_INT_EQ(kex_send_kexinit(client), 0);
122 	run_kex(client, server);
123 	TEST_DONE();
124 
125 	TEST_START("rekeying server");
126 	ASSERT_INT_EQ(kex_send_kexinit(server), 0);
127 	run_kex(client, server);
128 	TEST_DONE();
129 
130 	TEST_START("ssh_packet_get_state");
131 	state = sshbuf_new();
132 	ASSERT_PTR_NE(state, NULL);
133 	ASSERT_INT_EQ(ssh_packet_get_state(server, state), 0);
134 	ASSERT_INT_GE(sshbuf_len(state), 1);
135 	TEST_DONE();
136 
137 	TEST_START("ssh_packet_set_state");
138 	server2 = NULL;
139 	ASSERT_INT_EQ(ssh_init(&server2, 1, NULL), 0);
140 	ASSERT_PTR_NE(server2, NULL);
141 	ASSERT_INT_EQ(ssh_add_hostkey(server2, private), 0);
142 	kex_free(server2->kex);	/* XXX or should ssh_packet_set_state()? */
143 	ASSERT_INT_EQ(ssh_packet_set_state(server2, state), 0);
144 	ASSERT_INT_EQ(sshbuf_len(state), 0);
145 	sshbuf_free(state);
146 	ASSERT_PTR_NE(server2->kex, NULL);
147 	/* XXX we need to set the callbacks */
148 	server2->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
149 	server2->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
150 	server2->kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
151 	server2->kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
152 #ifdef OPENSSL_HAS_ECC
153 	server2->kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
154 #endif
155 	server2->kex->kex[KEX_C25519_SHA256] = kexc25519_server;
156 	server2->kex->load_host_public_key = server->kex->load_host_public_key;
157 	server2->kex->load_host_private_key = server->kex->load_host_private_key;
158 	server2->kex->sign = server->kex->sign;
159 	TEST_DONE();
160 
161 	TEST_START("rekeying server2");
162 	ASSERT_INT_EQ(kex_send_kexinit(server2), 0);
163 	run_kex(client, server2);
164 	ASSERT_INT_EQ(kex_send_kexinit(client), 0);
165 	run_kex(client, server2);
166 	TEST_DONE();
167 
168 	TEST_START("cleanup");
169 	sshkey_free(private);
170 	sshkey_free(public);
171 	ssh_free(client);
172 	ssh_free(server);
173 	ssh_free(server2);
174 	free(keyname);
175 	TEST_DONE();
176 }
177 
178 static void
do_kex(char * kex)179 do_kex(char *kex)
180 {
181 	do_kex_with_key(kex, KEY_RSA, 2048);
182 	do_kex_with_key(kex, KEY_DSA, 1024);
183 #ifdef OPENSSL_HAS_ECC
184 	do_kex_with_key(kex, KEY_ECDSA, 256);
185 #endif
186 	do_kex_with_key(kex, KEY_ED25519, 256);
187 }
188 
189 void
kex_tests(void)190 kex_tests(void)
191 {
192 	do_kex("curve25519-sha256@libssh.org");
193 #ifdef OPENSSL_HAS_ECC
194 	do_kex("ecdh-sha2-nistp256");
195 	do_kex("ecdh-sha2-nistp384");
196 	do_kex("ecdh-sha2-nistp521");
197 #endif
198 	do_kex("diffie-hellman-group-exchange-sha256");
199 	do_kex("diffie-hellman-group-exchange-sha1");
200 	do_kex("diffie-hellman-group14-sha1");
201 	do_kex("diffie-hellman-group1-sha1");
202 }
203