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) 2004-2011 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/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.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 = ctx->srp_ctx.TLS_ext_srp_username_callback;
141 /* set SRP N/g param callback for verification */
142 s->srp_ctx.SRP_verify_param_callback = ctx->srp_ctx.SRP_verify_param_callback;
143 /* set SRP client passwd callback */
144 s->srp_ctx.SRP_give_srp_client_pwd_callback = ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
154 s->srp_ctx.login = NULL;
155 s->srp_ctx.info = ctx->srp_ctx.info;
156 s->srp_ctx.strength = ctx->srp_ctx.strength;
158 if (((ctx->srp_ctx.N != NULL) &&
159 ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
160 ((ctx->srp_ctx.g != NULL) &&
161 ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
162 ((ctx->srp_ctx.s != NULL) &&
163 ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
164 ((ctx->srp_ctx.B != NULL) &&
165 ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
166 ((ctx->srp_ctx.A != NULL) &&
167 ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
168 ((ctx->srp_ctx.a != NULL) &&
169 ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
170 ((ctx->srp_ctx.v != NULL) &&
171 ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
172 ((ctx->srp_ctx.b != NULL) &&
173 ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL)))
175 SSLerr(SSL_F_SSL_SRP_CTX_INIT,ERR_R_BN_LIB);
178 if ((ctx->srp_ctx.login != NULL) &&
179 ((s->srp_ctx.login = BUF_strdup(ctx->srp_ctx.login)) == NULL))
181 SSLerr(SSL_F_SSL_SRP_CTX_INIT,ERR_R_INTERNAL_ERROR);
184 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
188 OPENSSL_free(s->srp_ctx.login);
189 BN_free(s->srp_ctx.N);
190 BN_free(s->srp_ctx.g);
191 BN_free(s->srp_ctx.s);
192 BN_free(s->srp_ctx.B);
193 BN_free(s->srp_ctx.A);
194 BN_free(s->srp_ctx.a);
195 BN_free(s->srp_ctx.b);
196 BN_free(s->srp_ctx.v);
200 int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
205 ctx->srp_ctx.SRP_cb_arg = NULL;
206 /* set client Hello login callback */
207 ctx->srp_ctx.TLS_ext_srp_username_callback = NULL;
208 /* set SRP N/g param callback for verification */
209 ctx->srp_ctx.SRP_verify_param_callback = NULL;
210 /* set SRP client passwd callback */
211 ctx->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
213 ctx->srp_ctx.N = NULL;
214 ctx->srp_ctx.g = NULL;
215 ctx->srp_ctx.s = NULL;
216 ctx->srp_ctx.B = NULL;
217 ctx->srp_ctx.A = NULL;
218 ctx->srp_ctx.a = NULL;
219 ctx->srp_ctx.b = NULL;
220 ctx->srp_ctx.v = NULL;
221 ctx->srp_ctx.login = NULL;
222 ctx->srp_ctx.srp_Mask = 0;
223 ctx->srp_ctx.info = NULL;
224 ctx->srp_ctx.strength = SRP_MINIMAL_N;
230 int SSL_srp_server_param_with_username(SSL *s, int *ad)
232 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
235 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
236 if ((s->srp_ctx.TLS_ext_srp_username_callback !=NULL) &&
237 ((al = s->srp_ctx.TLS_ext_srp_username_callback(s, ad, s->srp_ctx.SRP_cb_arg))!=SSL_ERROR_NONE))
240 *ad = SSL_AD_INTERNAL_ERROR;
241 if ((s->srp_ctx.N == NULL) ||
242 (s->srp_ctx.g == NULL) ||
243 (s->srp_ctx.s == NULL) ||
244 (s->srp_ctx.v == NULL))
245 return SSL3_AL_FATAL;
247 if (RAND_bytes(b, sizeof(b)) <= 0)
248 return SSL3_AL_FATAL;
249 s->srp_ctx.b = BN_bin2bn(b,sizeof(b),NULL);
250 OPENSSL_cleanse(b,sizeof(b));
252 /* Calculate: B = (kv + g^b) % N */
254 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)?
255 SSL_ERROR_NONE:SSL3_AL_FATAL;
258 /* If the server just has the raw password, make up a verifier entry on the fly */
259 int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass, const char *grp)
261 SRP_gN *GN = SRP_get_default_gN(grp);
262 if(GN == NULL) return -1;
263 s->srp_ctx.N = BN_dup(GN->N);
264 s->srp_ctx.g = BN_dup(GN->g);
265 if(s->srp_ctx.v != NULL)
267 BN_clear_free(s->srp_ctx.v);
270 if(s->srp_ctx.s != NULL)
272 BN_clear_free(s->srp_ctx.s);
275 if(!SRP_create_verifier_BN(user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g)) return -1;
280 int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
281 BIGNUM *sa, BIGNUM *v, char *info)
285 if (s->srp_ctx.N != NULL)
287 if (!BN_copy(s->srp_ctx.N,N))
289 BN_free(s->srp_ctx.N);
294 s->srp_ctx.N = BN_dup(N);
298 if (s->srp_ctx.g != NULL)
300 if (!BN_copy(s->srp_ctx.g,g))
302 BN_free(s->srp_ctx.g);
307 s->srp_ctx.g = BN_dup(g);
311 if (s->srp_ctx.s != NULL)
313 if (!BN_copy(s->srp_ctx.s,sa))
315 BN_free(s->srp_ctx.s);
320 s->srp_ctx.s = BN_dup(sa);
324 if (s->srp_ctx.v != NULL)
326 if (!BN_copy(s->srp_ctx.v,v))
328 BN_free(s->srp_ctx.v);
333 s->srp_ctx.v = BN_dup(v);
335 s->srp_ctx.info = info;
337 if (!(s->srp_ctx.N) ||
346 int SRP_generate_server_master_secret(SSL *s,unsigned char *master_key)
348 BIGNUM *K = NULL, *u = NULL;
349 int ret = -1, tmp_len;
350 unsigned char *tmp = NULL;
352 if (!SRP_Verify_A_mod_N(s->srp_ctx.A,s->srp_ctx.N))
354 if (!(u = SRP_Calc_u(s->srp_ctx.A,s->srp_ctx.B,s->srp_ctx.N)))
356 if (!(K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b, s->srp_ctx.N)))
359 tmp_len = BN_num_bytes(K);
360 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
363 ret = s->method->ssl3_enc->generate_master_secret(s,master_key,tmp,tmp_len);
367 OPENSSL_cleanse(tmp,tmp_len) ;
376 int SRP_generate_client_master_secret(SSL *s,unsigned char *master_key)
378 BIGNUM *x = NULL, *u = NULL, *K = NULL;
379 int ret = -1, tmp_len;
381 unsigned char *tmp = NULL;
383 /* Checks if b % n == 0
385 if (SRP_Verify_B_mod_N(s->srp_ctx.B,s->srp_ctx.N)==0) goto err;
386 if (!(u = SRP_Calc_u(s->srp_ctx.A,s->srp_ctx.B,s->srp_ctx.N))) goto err;
387 if (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) goto err;
388 if (!(passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(s, s->srp_ctx.SRP_cb_arg))) goto err;
389 if (!(x = SRP_Calc_x(s->srp_ctx.s,s->srp_ctx.login,passwd))) goto err;
390 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;
392 tmp_len = BN_num_bytes(K);
393 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) goto err;
395 ret = s->method->ssl3_enc->generate_master_secret(s,master_key,tmp,tmp_len);
399 OPENSSL_cleanse(tmp,tmp_len) ;
406 OPENSSL_cleanse(passwd,strlen(passwd)) ;
407 OPENSSL_free(passwd);
413 int SRP_Calc_A_param(SSL *s)
415 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
417 if (BN_num_bits(s->srp_ctx.N) < s->srp_ctx.strength)
420 if (s->srp_ctx.SRP_verify_param_callback ==NULL &&
421 !SRP_check_known_gN_param(s->srp_ctx.g,s->srp_ctx.N))
424 if (RAND_bytes(rnd, sizeof(rnd)) <= 0)
426 s->srp_ctx.a = BN_bin2bn(rnd,sizeof(rnd), s->srp_ctx.a);
427 OPENSSL_cleanse(rnd,sizeof(rnd));
429 if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a,s->srp_ctx.N,s->srp_ctx.g)))
432 /* We can have a callback to verify SRP param!! */
433 if (s->srp_ctx.SRP_verify_param_callback !=NULL)
434 return s->srp_ctx.SRP_verify_param_callback(s,s->srp_ctx.SRP_cb_arg);
439 BIGNUM *SSL_get_srp_g(SSL *s)
441 if (s->srp_ctx.g != NULL)
443 return s->ctx->srp_ctx.g;
446 BIGNUM *SSL_get_srp_N(SSL *s)
448 if (s->srp_ctx.N != NULL)
450 return s->ctx->srp_ctx.N;
453 char *SSL_get_srp_username(SSL *s)
455 if (s->srp_ctx.login != NULL)
456 return s->srp_ctx.login;
457 return s->ctx->srp_ctx.login;
460 char *SSL_get_srp_userinfo(SSL *s)
462 if (s->srp_ctx.info != NULL)
463 return s->srp_ctx.info;
464 return s->ctx->srp_ctx.info;
467 #define tls1_ctx_ctrl ssl3_ctx_ctrl
468 #define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
470 int SSL_CTX_set_srp_username(SSL_CTX *ctx,char *name)
472 return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_USERNAME,0,name);
475 int SSL_CTX_set_srp_password(SSL_CTX *ctx,char *password)
477 return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD,0,password);
480 int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
482 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
486 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx, int (*cb)(SSL *,void *))
488 return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
492 int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
494 return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_SRP_ARG,0,arg);
497 int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
498 int (*cb)(SSL *,int *,void *))
500 return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
504 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx, char *(*cb)(SSL *,void *))
506 return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,