2 * Written by Christophe Renou (christophe.renou@edelweb.fr) with the
3 * precious help of Peter Sylvester (peter.sylvester@edelweb.fr) for the
4 * EdelKey project and contributed to the OpenSSL project 2004.
6 /* ====================================================================
7 * Copyright (c) 2004-2011 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/crypto.h>
61 #include <openssl/rand.h>
62 #include <openssl/err.h>
65 #ifndef OPENSSL_NO_SRP
66 #include <openssl/srp.h>
68 int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st *ctx)
72 OPENSSL_free(ctx->srp_ctx.login);
73 BN_free(ctx->srp_ctx.N);
74 BN_free(ctx->srp_ctx.g);
75 BN_free(ctx->srp_ctx.s);
76 BN_free(ctx->srp_ctx.B);
77 BN_free(ctx->srp_ctx.A);
78 BN_free(ctx->srp_ctx.a);
79 BN_free(ctx->srp_ctx.b);
80 BN_free(ctx->srp_ctx.v);
81 ctx->srp_ctx.TLS_ext_srp_username_callback = NULL;
82 ctx->srp_ctx.SRP_cb_arg = NULL;
83 ctx->srp_ctx.SRP_verify_param_callback = NULL;
84 ctx->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
85 ctx->srp_ctx.N = NULL;
86 ctx->srp_ctx.g = NULL;
87 ctx->srp_ctx.s = NULL;
88 ctx->srp_ctx.B = NULL;
89 ctx->srp_ctx.A = NULL;
90 ctx->srp_ctx.a = NULL;
91 ctx->srp_ctx.b = NULL;
92 ctx->srp_ctx.v = NULL;
93 ctx->srp_ctx.login = NULL;
94 ctx->srp_ctx.info = NULL;
95 ctx->srp_ctx.strength = SRP_MINIMAL_N;
96 ctx->srp_ctx.srp_Mask = 0;
100 int SSL_SRP_CTX_free(struct ssl_st *s)
104 OPENSSL_free(s->srp_ctx.login);
105 BN_free(s->srp_ctx.N);
106 BN_free(s->srp_ctx.g);
107 BN_free(s->srp_ctx.s);
108 BN_free(s->srp_ctx.B);
109 BN_free(s->srp_ctx.A);
110 BN_free(s->srp_ctx.a);
111 BN_free(s->srp_ctx.b);
112 BN_free(s->srp_ctx.v);
113 s->srp_ctx.TLS_ext_srp_username_callback = NULL;
114 s->srp_ctx.SRP_cb_arg = NULL;
115 s->srp_ctx.SRP_verify_param_callback = NULL;
116 s->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
125 s->srp_ctx.login = NULL;
126 s->srp_ctx.info = NULL;
127 s->srp_ctx.strength = SRP_MINIMAL_N;
128 s->srp_ctx.srp_Mask = 0;
132 int SSL_SRP_CTX_init(struct ssl_st *s)
136 if ((s == NULL) || ((ctx = s->ctx) == NULL))
138 s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
139 /* set client Hello login callback */
140 s->srp_ctx.TLS_ext_srp_username_callback =
141 ctx->srp_ctx.TLS_ext_srp_username_callback;
142 /* set SRP N/g param callback for verification */
143 s->srp_ctx.SRP_verify_param_callback =
144 ctx->srp_ctx.SRP_verify_param_callback;
145 /* set SRP client passwd callback */
146 s->srp_ctx.SRP_give_srp_client_pwd_callback =
147 ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
157 s->srp_ctx.login = NULL;
158 s->srp_ctx.info = ctx->srp_ctx.info;
159 s->srp_ctx.strength = ctx->srp_ctx.strength;
161 if (((ctx->srp_ctx.N != NULL) &&
162 ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
163 ((ctx->srp_ctx.g != NULL) &&
164 ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
165 ((ctx->srp_ctx.s != NULL) &&
166 ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
167 ((ctx->srp_ctx.B != NULL) &&
168 ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
169 ((ctx->srp_ctx.A != NULL) &&
170 ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
171 ((ctx->srp_ctx.a != NULL) &&
172 ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
173 ((ctx->srp_ctx.v != NULL) &&
174 ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
175 ((ctx->srp_ctx.b != NULL) &&
176 ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) {
177 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_BN_LIB);
180 if ((ctx->srp_ctx.login != NULL) &&
181 ((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) {
182 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR);
185 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
189 OPENSSL_free(s->srp_ctx.login);
190 BN_free(s->srp_ctx.N);
191 BN_free(s->srp_ctx.g);
192 BN_free(s->srp_ctx.s);
193 BN_free(s->srp_ctx.B);
194 BN_free(s->srp_ctx.A);
195 BN_free(s->srp_ctx.a);
196 BN_free(s->srp_ctx.b);
197 BN_free(s->srp_ctx.v);
201 int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
206 ctx->srp_ctx.SRP_cb_arg = NULL;
207 /* set client Hello login callback */
208 ctx->srp_ctx.TLS_ext_srp_username_callback = NULL;
209 /* set SRP N/g param callback for verification */
210 ctx->srp_ctx.SRP_verify_param_callback = NULL;
211 /* set SRP client passwd callback */
212 ctx->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
214 ctx->srp_ctx.N = NULL;
215 ctx->srp_ctx.g = NULL;
216 ctx->srp_ctx.s = NULL;
217 ctx->srp_ctx.B = NULL;
218 ctx->srp_ctx.A = NULL;
219 ctx->srp_ctx.a = NULL;
220 ctx->srp_ctx.b = NULL;
221 ctx->srp_ctx.v = NULL;
222 ctx->srp_ctx.login = NULL;
223 ctx->srp_ctx.srp_Mask = 0;
224 ctx->srp_ctx.info = NULL;
225 ctx->srp_ctx.strength = SRP_MINIMAL_N;
231 int SSL_srp_server_param_with_username(SSL *s, int *ad)
233 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
236 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
237 if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) &&
239 s->srp_ctx.TLS_ext_srp_username_callback(s, ad,
240 s->srp_ctx.SRP_cb_arg)) !=
244 *ad = SSL_AD_INTERNAL_ERROR;
245 if ((s->srp_ctx.N == NULL) ||
246 (s->srp_ctx.g == NULL) ||
247 (s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL))
248 return SSL3_AL_FATAL;
250 if (RAND_bytes(b, sizeof(b)) <= 0)
251 return SSL3_AL_FATAL;
252 s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL);
253 OPENSSL_cleanse(b, sizeof(b));
255 /* Calculate: B = (kv + g^b) % N */
257 return ((s->srp_ctx.B =
258 SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
260 NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
264 * If the server just has the raw password, make up a verifier entry on the
267 int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
270 SRP_gN *GN = SRP_get_default_gN(grp);
273 s->srp_ctx.N = BN_dup(GN->N);
274 s->srp_ctx.g = BN_dup(GN->g);
275 BN_clear_free(s->srp_ctx.v);
277 BN_clear_free(s->srp_ctx.s);
279 if (!SRP_create_verifier_BN
280 (user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g))
286 int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
287 BIGNUM *sa, BIGNUM *v, char *info)
290 if (s->srp_ctx.N != NULL) {
291 if (!BN_copy(s->srp_ctx.N, N)) {
292 BN_free(s->srp_ctx.N);
296 s->srp_ctx.N = BN_dup(N);
299 if (s->srp_ctx.g != NULL) {
300 if (!BN_copy(s->srp_ctx.g, g)) {
301 BN_free(s->srp_ctx.g);
305 s->srp_ctx.g = BN_dup(g);
308 if (s->srp_ctx.s != NULL) {
309 if (!BN_copy(s->srp_ctx.s, sa)) {
310 BN_free(s->srp_ctx.s);
314 s->srp_ctx.s = BN_dup(sa);
317 if (s->srp_ctx.v != NULL) {
318 if (!BN_copy(s->srp_ctx.v, v)) {
319 BN_free(s->srp_ctx.v);
323 s->srp_ctx.v = BN_dup(v);
325 s->srp_ctx.info = info;
327 if (!(s->srp_ctx.N) ||
328 !(s->srp_ctx.g) || !(s->srp_ctx.s) || !(s->srp_ctx.v))
334 int srp_generate_server_master_secret(SSL *s)
336 BIGNUM *K = NULL, *u = NULL;
337 int ret = -1, tmp_len = 0;
338 unsigned char *tmp = NULL;
340 if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N))
342 if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL)
344 if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
345 s->srp_ctx.N)) == NULL)
348 tmp_len = BN_num_bytes(K);
349 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
352 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
360 int srp_generate_client_master_secret(SSL *s)
362 BIGNUM *x = NULL, *u = NULL, *K = NULL;
363 int ret = -1, tmp_len = 0;
365 unsigned char *tmp = NULL;
368 * Checks if b % n == 0
370 if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0)
372 if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL)
374 if (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL)
378 s->srp_ctx.SRP_give_srp_client_pwd_callback(s,
379 s->srp_ctx.SRP_cb_arg)))
381 if ((x = SRP_Calc_x(s->srp_ctx.s, s->srp_ctx.login, passwd)) == NULL)
383 if ((K = SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, s->srp_ctx.g, x,
384 s->srp_ctx.a, u)) == NULL)
387 tmp_len = BN_num_bytes(K);
388 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
391 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
396 OPENSSL_clear_free(passwd, strlen(passwd));
401 int srp_verify_server_param(SSL *s, int *al)
403 SRP_CTX *srp = &s->srp_ctx;
405 * Sanity check parameters: we can quickly check B % N == 0 by checking B
408 if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0
409 || BN_is_zero(srp->B)) {
410 *al = SSL3_AD_ILLEGAL_PARAMETER;
414 if (BN_num_bits(srp->N) < srp->strength) {
415 *al = TLS1_AD_INSUFFICIENT_SECURITY;
419 if (srp->SRP_verify_param_callback) {
420 if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) {
421 *al = TLS1_AD_INSUFFICIENT_SECURITY;
424 } else if (!SRP_check_known_gN_param(srp->g, srp->N)) {
425 *al = TLS1_AD_INSUFFICIENT_SECURITY;
432 int SRP_Calc_A_param(SSL *s)
434 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
436 if (RAND_bytes(rnd, sizeof(rnd)) <= 0)
438 s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
439 OPENSSL_cleanse(rnd, sizeof(rnd));
442 (s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g)))
448 BIGNUM *SSL_get_srp_g(SSL *s)
450 if (s->srp_ctx.g != NULL)
452 return s->ctx->srp_ctx.g;
455 BIGNUM *SSL_get_srp_N(SSL *s)
457 if (s->srp_ctx.N != NULL)
459 return s->ctx->srp_ctx.N;
462 char *SSL_get_srp_username(SSL *s)
464 if (s->srp_ctx.login != NULL)
465 return s->srp_ctx.login;
466 return s->ctx->srp_ctx.login;
469 char *SSL_get_srp_userinfo(SSL *s)
471 if (s->srp_ctx.info != NULL)
472 return s->srp_ctx.info;
473 return s->ctx->srp_ctx.info;
476 # define tls1_ctx_ctrl ssl3_ctx_ctrl
477 # define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
479 int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name)
481 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name);
484 int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password)
486 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password);
489 int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
491 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
495 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
496 int (*cb) (SSL *, void *))
498 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
502 int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
504 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg);
507 int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
508 int (*cb) (SSL *, int *, void *))
510 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
514 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
515 char *(*cb) (SSL *, void *))
517 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,