1 /*
2 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * SRP is deprecated, so we're going to have to use some deprecated APIs in
12 * order to test it.
13 */
14 #define OPENSSL_SUPPRESS_DEPRECATED
15
16 #include <openssl/opensslconf.h>
17 # include "testutil.h"
18
19 #ifdef OPENSSL_NO_SRP
20 # include <stdio.h>
21 #else
22
23 # include <openssl/srp.h>
24 # include <openssl/rand.h>
25 # include <openssl/err.h>
26
27 # define RANDOM_SIZE 32 /* use 256 bits on each side */
28
run_srp(const char * username,const char * client_pass,const char * server_pass)29 static int run_srp(const char *username, const char *client_pass,
30 const char *server_pass)
31 {
32 int ret = 0;
33 BIGNUM *s = NULL;
34 BIGNUM *v = NULL;
35 BIGNUM *a = NULL;
36 BIGNUM *b = NULL;
37 BIGNUM *u = NULL;
38 BIGNUM *x = NULL;
39 BIGNUM *Apub = NULL;
40 BIGNUM *Bpub = NULL;
41 BIGNUM *Kclient = NULL;
42 BIGNUM *Kserver = NULL;
43 unsigned char rand_tmp[RANDOM_SIZE];
44 /* use builtin 1024-bit params */
45 const SRP_gN *GN;
46
47 if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
48 return 0;
49
50 /* Set up server's password entry */
51 if (!TEST_true(SRP_create_verifier_BN(username, server_pass,
52 &s, &v, GN->N, GN->g)))
53 goto end;
54
55 test_output_bignum("N", GN->N);
56 test_output_bignum("g", GN->g);
57 test_output_bignum("Salt", s);
58 test_output_bignum("Verifier", v);
59
60 /* Server random */
61 RAND_bytes(rand_tmp, sizeof(rand_tmp));
62 b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
63 if (!TEST_BN_ne_zero(b))
64 goto end;
65 test_output_bignum("b", b);
66
67 /* Server's first message */
68 Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
69 test_output_bignum("B", Bpub);
70
71 if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
72 goto end;
73
74 /* Client random */
75 RAND_bytes(rand_tmp, sizeof(rand_tmp));
76 a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
77 if (!TEST_BN_ne_zero(a))
78 goto end;
79 test_output_bignum("a", a);
80
81 /* Client's response */
82 Apub = SRP_Calc_A(a, GN->N, GN->g);
83 test_output_bignum("A", Apub);
84
85 if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
86 goto end;
87
88 /* Both sides calculate u */
89 u = SRP_Calc_u(Apub, Bpub, GN->N);
90
91 /* Client's key */
92 x = SRP_Calc_x(s, username, client_pass);
93 Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
94 test_output_bignum("Client's key", Kclient);
95
96 /* Server's key */
97 Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
98 test_output_bignum("Server's key", Kserver);
99
100 if (!TEST_BN_eq(Kclient, Kserver))
101 goto end;
102
103 ret = 1;
104
105 end:
106 BN_clear_free(Kclient);
107 BN_clear_free(Kserver);
108 BN_clear_free(x);
109 BN_free(u);
110 BN_free(Apub);
111 BN_clear_free(a);
112 BN_free(Bpub);
113 BN_clear_free(b);
114 BN_free(s);
115 BN_clear_free(v);
116
117 return ret;
118 }
119
check_bn(const char * name,const BIGNUM * bn,const char * hexbn)120 static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
121 {
122 BIGNUM *tmp = NULL;
123 int r;
124
125 if (!TEST_true(BN_hex2bn(&tmp, hexbn)))
126 return 0;
127
128 if (BN_cmp(bn, tmp) != 0)
129 TEST_error("unexpected %s value", name);
130 r = TEST_BN_eq(bn, tmp);
131 BN_free(tmp);
132 return r;
133 }
134
135 /* SRP test vectors from RFC5054 */
run_srp_kat(void)136 static int run_srp_kat(void)
137 {
138 int ret = 0;
139 BIGNUM *s = NULL;
140 BIGNUM *v = NULL;
141 BIGNUM *a = NULL;
142 BIGNUM *b = NULL;
143 BIGNUM *u = NULL;
144 BIGNUM *x = NULL;
145 BIGNUM *Apub = NULL;
146 BIGNUM *Bpub = NULL;
147 BIGNUM *Kclient = NULL;
148 BIGNUM *Kserver = NULL;
149 /* use builtin 1024-bit params */
150 const SRP_gN *GN;
151
152 if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
153 goto err;
154 BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
155 /* Set up server's password entry */
156 if (!TEST_true(SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
157 GN->g)))
158 goto err;
159
160 TEST_info("checking v");
161 if (!TEST_true(check_bn("v", v,
162 "7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
163 "9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
164 "C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
165 "EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
166 "E955A5E29E7AB245DB2BE315E2099AFB")))
167 goto err;
168 TEST_note(" okay");
169
170 /* Server random */
171 BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
172 "05284D20");
173
174 /* Server's first message */
175 Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
176 if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
177 goto err;
178
179 TEST_info("checking B");
180 if (!TEST_true(check_bn("B", Bpub,
181 "BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
182 "BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
183 "6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
184 "37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
185 "EB4012B7D7665238A8E3FB004B117B58")))
186 goto err;
187 TEST_note(" okay");
188
189 /* Client random */
190 BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
191 "DA2D4393");
192
193 /* Client's response */
194 Apub = SRP_Calc_A(a, GN->N, GN->g);
195 if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
196 goto err;
197
198 TEST_info("checking A");
199 if (!TEST_true(check_bn("A", Apub,
200 "61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
201 "4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
202 "8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
203 "BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
204 "B349EF5D76988A3672FAC47B0769447B")))
205 goto err;
206 TEST_note(" okay");
207
208 /* Both sides calculate u */
209 u = SRP_Calc_u(Apub, Bpub, GN->N);
210
211 if (!TEST_true(check_bn("u", u,
212 "CE38B9593487DA98554ED47D70A7AE5F462EF019")))
213 goto err;
214
215 /* Client's key */
216 x = SRP_Calc_x(s, "alice", "password123");
217 Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
218 TEST_info("checking client's key");
219 if (!TEST_true(check_bn("Client's key", Kclient,
220 "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
221 "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
222 "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
223 "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
224 "C346D7E474B29EDE8A469FFECA686E5A")))
225 goto err;
226 TEST_note(" okay");
227
228 /* Server's key */
229 Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
230 TEST_info("checking server's key");
231 if (!TEST_true(check_bn("Server's key", Kserver,
232 "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
233 "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
234 "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
235 "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
236 "C346D7E474B29EDE8A469FFECA686E5A")))
237 goto err;
238 TEST_note(" okay");
239
240 ret = 1;
241
242 err:
243 BN_clear_free(Kclient);
244 BN_clear_free(Kserver);
245 BN_clear_free(x);
246 BN_free(u);
247 BN_free(Apub);
248 BN_clear_free(a);
249 BN_free(Bpub);
250 BN_clear_free(b);
251 BN_free(s);
252 BN_clear_free(v);
253
254 return ret;
255 }
256
run_srp_tests(void)257 static int run_srp_tests(void)
258 {
259 /* "Negative" test, expect a mismatch */
260 TEST_info("run_srp: expecting a mismatch");
261 if (!TEST_false(run_srp("alice", "password1", "password2")))
262 return 0;
263
264 /* "Positive" test, should pass */
265 TEST_info("run_srp: expecting a match");
266 if (!TEST_true(run_srp("alice", "password", "password")))
267 return 0;
268
269 return 1;
270 }
271 #endif
272
setup_tests(void)273 int setup_tests(void)
274 {
275 #ifdef OPENSSL_NO_SRP
276 printf("No SRP support\n");
277 #else
278 ADD_TEST(run_srp_tests);
279 ADD_TEST(run_srp_kat);
280 #endif
281 return 1;
282 }
283