2 /* Written by Christophe Renou (christophe.renou@edelweb.fr) with
3 * the precious help of Peter Sylvester (peter.sylvester@edelweb.fr)
4 * for the EdelKey project and contributed to the OpenSSL project 2004.
6 /* ====================================================================
7 * Copyright (c) 2004 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/srp.h>
63 #include <openssl/err.h>
66 #ifndef OPENSSL_NO_SRP
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.SRP_TLS_ext_missing_srp_client_username_callback = NULL;
86 ctx->srp_ctx.N = NULL;
87 ctx->srp_ctx.g = NULL;
88 ctx->srp_ctx.s = NULL;
89 ctx->srp_ctx.B = NULL;
90 ctx->srp_ctx.A = NULL;
91 ctx->srp_ctx.a = NULL;
92 ctx->srp_ctx.b = NULL;
93 ctx->srp_ctx.v = NULL;
94 ctx->srp_ctx.login = NULL;
95 ctx->srp_ctx.info = NULL;
96 ctx->srp_ctx.strength = SRP_MINIMAL_N;
97 ctx->srp_ctx.srp_Mask = 0;
101 int SSL_SRP_CTX_free(struct ssl_st *s)
105 OPENSSL_free(s->srp_ctx.login);
106 BN_free(s->srp_ctx.N);
107 BN_free(s->srp_ctx.g);
108 BN_free(s->srp_ctx.s);
109 BN_free(s->srp_ctx.B);
110 BN_free(s->srp_ctx.A);
111 BN_free(s->srp_ctx.a);
112 BN_free(s->srp_ctx.b);
113 BN_free(s->srp_ctx.v);
114 s->srp_ctx.TLS_ext_srp_username_callback = NULL;
115 s->srp_ctx.SRP_cb_arg = NULL;
116 s->srp_ctx.SRP_verify_param_callback = NULL;
117 s->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
118 s->srp_ctx.SRP_TLS_ext_missing_srp_client_username_callback = NULL;
127 s->srp_ctx.login = NULL;
128 s->srp_ctx.info = NULL;
129 s->srp_ctx.strength = SRP_MINIMAL_N;
130 s->srp_ctx.srp_Mask = 0;
134 int SSL_SRP_CTX_init(struct ssl_st *s)
138 if ((s == NULL) || ((ctx = s->ctx) == NULL))
140 s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
141 /* set client Hello login callback */
142 s->srp_ctx.TLS_ext_srp_username_callback = ctx->srp_ctx.TLS_ext_srp_username_callback;
143 /* set SRP N/g param callback for verification */
144 s->srp_ctx.SRP_verify_param_callback = ctx->srp_ctx.SRP_verify_param_callback;
145 /* set SRP client passwd callback */
146 s->srp_ctx.SRP_give_srp_client_pwd_callback = ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
147 s->srp_ctx.SRP_TLS_ext_missing_srp_client_username_callback = ctx->srp_ctx.SRP_TLS_ext_missing_srp_client_username_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)))
178 SSLerr(SSL_F_SSL_SRP_CTX_INIT,ERR_R_BN_LIB);
181 if ((ctx->srp_ctx.login != NULL) &&
182 ((s->srp_ctx.login = BUF_strdup(ctx->srp_ctx.login)) == NULL))
184 SSLerr(SSL_F_SSL_SRP_CTX_INIT,ERR_R_INTERNAL_ERROR);
187 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
191 OPENSSL_free(s->srp_ctx.login);
192 BN_free(s->srp_ctx.N);
193 BN_free(s->srp_ctx.g);
194 BN_free(s->srp_ctx.s);
195 BN_free(s->srp_ctx.B);
196 BN_free(s->srp_ctx.A);
197 BN_free(s->srp_ctx.a);
198 BN_free(s->srp_ctx.b);
199 BN_free(s->srp_ctx.v);
203 int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
208 ctx->srp_ctx.SRP_cb_arg = NULL;
209 /* set client Hello login callback */
210 ctx->srp_ctx.TLS_ext_srp_username_callback = NULL;
211 /* set SRP N/g param callback for verification */
212 ctx->srp_ctx.SRP_verify_param_callback = NULL;
213 /* set SRP client passwd callback */
214 ctx->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
215 ctx->srp_ctx.SRP_TLS_ext_missing_srp_client_username_callback = NULL;
217 ctx->srp_ctx.N = NULL;
218 ctx->srp_ctx.g = NULL;
219 ctx->srp_ctx.s = NULL;
220 ctx->srp_ctx.B = NULL;
221 ctx->srp_ctx.A = NULL;
222 ctx->srp_ctx.a = NULL;
223 ctx->srp_ctx.b = NULL;
224 ctx->srp_ctx.v = NULL;
225 ctx->srp_ctx.login = NULL;
226 ctx->srp_ctx.srp_Mask = 0;
227 ctx->srp_ctx.info = NULL;
228 ctx->srp_ctx.strength = SRP_MINIMAL_N;
234 int SSL_srp_server_param_with_username(SSL *s, int *ad)
236 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
239 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
240 if ((s->srp_ctx.TLS_ext_srp_username_callback !=NULL) &&
241 ((al = s->srp_ctx.TLS_ext_srp_username_callback(s, ad, s->srp_ctx.SRP_cb_arg))!=SSL_ERROR_NONE))
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) ||
248 (s->srp_ctx.v == NULL))
249 return SSL3_AL_FATAL;
251 if (RAND_bytes(b, sizeof(b)) <= 0)
252 return SSL3_AL_FATAL;
253 s->srp_ctx.b = BN_bin2bn(b,sizeof(b),NULL);
254 OPENSSL_cleanse(b,sizeof(b));
256 /* Calculate: B = (kv + g^b) % N */
258 return ((s->srp_ctx.B = SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g, s->srp_ctx.v)) != NULL)?
259 SSL_ERROR_NONE:SSL3_AL_FATAL;
262 /* If the server just has the raw password, make up a verifier entry on the fly */
263 int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass, const char *grp)
265 SRP_gN *GN = SRP_get_default_gN(grp);
266 if(GN == NULL) return -1;
267 s->srp_ctx.N = BN_dup(GN->N);
268 s->srp_ctx.g = BN_dup(GN->g);
269 if(s->srp_ctx.v != NULL)
271 BN_clear_free(s->srp_ctx.v);
274 if(s->srp_ctx.s != NULL)
276 BN_clear_free(s->srp_ctx.s);
279 if(!SRP_create_verifier_BN(user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g)) return -1;
284 int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
285 BIGNUM *sa, BIGNUM *v, char *info)
289 if (s->srp_ctx.N != NULL)
291 if (!BN_copy(s->srp_ctx.N,N))
293 BN_free(s->srp_ctx.N);
298 s->srp_ctx.N = BN_dup(N);
302 if (s->srp_ctx.g != NULL)
304 if (!BN_copy(s->srp_ctx.g,g))
306 BN_free(s->srp_ctx.g);
311 s->srp_ctx.g = BN_dup(g);
315 if (s->srp_ctx.s != NULL)
317 if (!BN_copy(s->srp_ctx.s,sa))
319 BN_free(s->srp_ctx.s);
324 s->srp_ctx.s = BN_dup(sa);
328 if (s->srp_ctx.v != NULL)
330 if (!BN_copy(s->srp_ctx.v,v))
332 BN_free(s->srp_ctx.v);
337 s->srp_ctx.v = BN_dup(v);
339 s->srp_ctx.info = info;
341 if (!(s->srp_ctx.N) ||
350 int SRP_generate_server_master_secret(SSL *s,unsigned char *master_key)
352 BIGNUM *K = NULL, *u = NULL;
353 int ret = -1, tmp_len;
354 unsigned char *tmp = NULL;
356 if (!SRP_Verify_A_mod_N(s->srp_ctx.A,s->srp_ctx.N))
358 if (!(u = SRP_Calc_u(s->srp_ctx.A,s->srp_ctx.B,s->srp_ctx.N)))
360 if (!(K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b, s->srp_ctx.N)))
363 tmp_len = BN_num_bytes(K);
364 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
367 ret = s->method->ssl3_enc->generate_master_secret(s,master_key,tmp,tmp_len);
371 OPENSSL_cleanse(tmp,tmp_len) ;
380 int SRP_generate_client_master_secret(SSL *s,unsigned char *master_key)
382 BIGNUM *x = NULL, *u = NULL, *K = NULL;
383 int ret = -1, tmp_len;
385 unsigned char *tmp = NULL;
387 /* Checks if b % n == 0
389 if (SRP_Verify_B_mod_N(s->srp_ctx.B,s->srp_ctx.N)==0) goto err;
390 if (!(u = SRP_Calc_u(s->srp_ctx.A,s->srp_ctx.B,s->srp_ctx.N))) goto err;
391 if (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) goto err;
392 if (!(passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(s, s->srp_ctx.SRP_cb_arg))) goto err;
393 if (!(x = SRP_Calc_x(s->srp_ctx.s,s->srp_ctx.login,passwd))) goto err;
394 if (!(K = SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, s->srp_ctx.g, x, s->srp_ctx.a, u))) goto err;
396 tmp_len = BN_num_bytes(K);
397 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) goto err;
399 ret = s->method->ssl3_enc->generate_master_secret(s,master_key,tmp,tmp_len);
403 OPENSSL_cleanse(tmp,tmp_len) ;
410 OPENSSL_cleanse(passwd,strlen(passwd)) ;
411 OPENSSL_free(passwd);
417 int SRP_Calc_A_param(SSL *s)
419 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
421 if (BN_num_bits(s->srp_ctx.N) < s->srp_ctx.strength)
424 if (s->srp_ctx.SRP_verify_param_callback ==NULL &&
425 !SRP_check_known_gN_param(s->srp_ctx.g,s->srp_ctx.N))
428 if (RAND_bytes(rnd, sizeof(rnd)) <= 0)
430 s->srp_ctx.a = BN_bin2bn(rnd,sizeof(rnd), s->srp_ctx.a);
431 OPENSSL_cleanse(rnd,sizeof(rnd));
433 if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a,s->srp_ctx.N,s->srp_ctx.g)))
436 /* We can have a callback to verify SRP param!! */
437 if (s->srp_ctx.SRP_verify_param_callback !=NULL)
438 return s->srp_ctx.SRP_verify_param_callback(s,s->srp_ctx.SRP_cb_arg);
443 int SRP_have_to_put_srp_username(SSL *s)
445 if (s->srp_ctx.SRP_TLS_ext_missing_srp_client_username_callback == NULL)
447 if ((s->srp_ctx.login = s->srp_ctx.SRP_TLS_ext_missing_srp_client_username_callback(s,s->srp_ctx.SRP_cb_arg)) == NULL)
449 s->srp_ctx.srp_Mask|=SSL_kSRP;
453 BIGNUM *SSL_get_srp_g(SSL *s)
455 if (s->srp_ctx.g != NULL)
457 return s->ctx->srp_ctx.g;
460 BIGNUM *SSL_get_srp_N(SSL *s)
462 if (s->srp_ctx.N != NULL)
464 return s->ctx->srp_ctx.N;
467 char *SSL_get_srp_username(SSL *s)
469 if (s->srp_ctx.login != NULL)
470 return s->srp_ctx.login;
471 return s->ctx->srp_ctx.login;
474 char *SSL_get_srp_userinfo(SSL *s)
476 if (s->srp_ctx.info != NULL)
477 return s->srp_ctx.info;
478 return s->ctx->srp_ctx.info;
481 #define tls1_ctx_ctrl ssl3_ctx_ctrl
482 #define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
484 int SSL_CTX_set_srp_username(SSL_CTX *ctx,char *name)
486 return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_USERNAME,0,name);
489 int SSL_CTX_set_srp_password(SSL_CTX *ctx,char *password)
491 return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD,0,password);
494 int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
496 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
500 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx, int (*cb)(SSL *,void *))
502 return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
506 int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
508 return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_SRP_ARG,0,arg);
511 int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
512 int (*cb)(SSL *,int *,void *))
514 return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
518 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx, char *(*cb)(SSL *,void *))
520 return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,
524 int SSL_CTX_set_srp_missing_srp_username_callback(SSL_CTX *ctx,
525 char *(*cb)(SSL *,void *))
527 return tls1_ctx_callback_ctrl(ctx,
528 SSL_CTRL_SET_TLS_EXT_SRP_MISSING_CLIENT_USERNAME_CB,