2 * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2004, EdelKey Project. All Rights Reserved.
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
10 * Originally written by Christophe Renou and Peter Sylvester,
11 * for the EdelKey project.
14 #include <openssl/crypto.h>
15 #include <openssl/rand.h>
16 #include <openssl/err.h>
17 #include "ssl_local.h"
19 #ifndef OPENSSL_NO_SRP
20 # include <openssl/srp.h>
22 int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st
*ctx
)
26 OPENSSL_free(ctx
->srp_ctx
.login
);
27 OPENSSL_free(ctx
->srp_ctx
.info
);
28 BN_free(ctx
->srp_ctx
.N
);
29 BN_free(ctx
->srp_ctx
.g
);
30 BN_free(ctx
->srp_ctx
.s
);
31 BN_free(ctx
->srp_ctx
.B
);
32 BN_free(ctx
->srp_ctx
.A
);
33 BN_free(ctx
->srp_ctx
.a
);
34 BN_free(ctx
->srp_ctx
.b
);
35 BN_free(ctx
->srp_ctx
.v
);
36 memset(&ctx
->srp_ctx
, 0, sizeof(ctx
->srp_ctx
));
37 ctx
->srp_ctx
.strength
= SRP_MINIMAL_N
;
41 int SSL_SRP_CTX_free(struct ssl_st
*s
)
45 OPENSSL_free(s
->srp_ctx
.login
);
46 OPENSSL_free(s
->srp_ctx
.info
);
47 BN_free(s
->srp_ctx
.N
);
48 BN_free(s
->srp_ctx
.g
);
49 BN_free(s
->srp_ctx
.s
);
50 BN_free(s
->srp_ctx
.B
);
51 BN_free(s
->srp_ctx
.A
);
52 BN_free(s
->srp_ctx
.a
);
53 BN_free(s
->srp_ctx
.b
);
54 BN_free(s
->srp_ctx
.v
);
55 memset(&s
->srp_ctx
, 0, sizeof(s
->srp_ctx
));
56 s
->srp_ctx
.strength
= SRP_MINIMAL_N
;
60 int SSL_SRP_CTX_init(struct ssl_st
*s
)
64 if ((s
== NULL
) || ((ctx
= s
->ctx
) == NULL
))
67 memset(&s
->srp_ctx
, 0, sizeof(s
->srp_ctx
));
69 s
->srp_ctx
.SRP_cb_arg
= ctx
->srp_ctx
.SRP_cb_arg
;
70 /* set client Hello login callback */
71 s
->srp_ctx
.TLS_ext_srp_username_callback
=
72 ctx
->srp_ctx
.TLS_ext_srp_username_callback
;
73 /* set SRP N/g param callback for verification */
74 s
->srp_ctx
.SRP_verify_param_callback
=
75 ctx
->srp_ctx
.SRP_verify_param_callback
;
76 /* set SRP client passwd callback */
77 s
->srp_ctx
.SRP_give_srp_client_pwd_callback
=
78 ctx
->srp_ctx
.SRP_give_srp_client_pwd_callback
;
80 s
->srp_ctx
.strength
= ctx
->srp_ctx
.strength
;
82 if (((ctx
->srp_ctx
.N
!= NULL
) &&
83 ((s
->srp_ctx
.N
= BN_dup(ctx
->srp_ctx
.N
)) == NULL
)) ||
84 ((ctx
->srp_ctx
.g
!= NULL
) &&
85 ((s
->srp_ctx
.g
= BN_dup(ctx
->srp_ctx
.g
)) == NULL
)) ||
86 ((ctx
->srp_ctx
.s
!= NULL
) &&
87 ((s
->srp_ctx
.s
= BN_dup(ctx
->srp_ctx
.s
)) == NULL
)) ||
88 ((ctx
->srp_ctx
.B
!= NULL
) &&
89 ((s
->srp_ctx
.B
= BN_dup(ctx
->srp_ctx
.B
)) == NULL
)) ||
90 ((ctx
->srp_ctx
.A
!= NULL
) &&
91 ((s
->srp_ctx
.A
= BN_dup(ctx
->srp_ctx
.A
)) == NULL
)) ||
92 ((ctx
->srp_ctx
.a
!= NULL
) &&
93 ((s
->srp_ctx
.a
= BN_dup(ctx
->srp_ctx
.a
)) == NULL
)) ||
94 ((ctx
->srp_ctx
.v
!= NULL
) &&
95 ((s
->srp_ctx
.v
= BN_dup(ctx
->srp_ctx
.v
)) == NULL
)) ||
96 ((ctx
->srp_ctx
.b
!= NULL
) &&
97 ((s
->srp_ctx
.b
= BN_dup(ctx
->srp_ctx
.b
)) == NULL
))) {
98 SSLerr(SSL_F_SSL_SRP_CTX_INIT
, ERR_R_BN_LIB
);
101 if ((ctx
->srp_ctx
.login
!= NULL
) &&
102 ((s
->srp_ctx
.login
= OPENSSL_strdup(ctx
->srp_ctx
.login
)) == NULL
)) {
103 SSLerr(SSL_F_SSL_SRP_CTX_INIT
, ERR_R_INTERNAL_ERROR
);
106 if ((ctx
->srp_ctx
.info
!= NULL
) &&
107 ((s
->srp_ctx
.info
= BUF_strdup(ctx
->srp_ctx
.info
)) == NULL
)) {
108 SSLerr(SSL_F_SSL_SRP_CTX_INIT
, ERR_R_INTERNAL_ERROR
);
111 s
->srp_ctx
.srp_Mask
= ctx
->srp_ctx
.srp_Mask
;
115 OPENSSL_free(s
->srp_ctx
.login
);
116 OPENSSL_free(s
->srp_ctx
.info
);
117 BN_free(s
->srp_ctx
.N
);
118 BN_free(s
->srp_ctx
.g
);
119 BN_free(s
->srp_ctx
.s
);
120 BN_free(s
->srp_ctx
.B
);
121 BN_free(s
->srp_ctx
.A
);
122 BN_free(s
->srp_ctx
.a
);
123 BN_free(s
->srp_ctx
.b
);
124 BN_free(s
->srp_ctx
.v
);
125 memset(&s
->srp_ctx
, 0, sizeof(s
->srp_ctx
));
129 int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st
*ctx
)
134 memset(&ctx
->srp_ctx
, 0, sizeof(ctx
->srp_ctx
));
135 ctx
->srp_ctx
.strength
= SRP_MINIMAL_N
;
141 int SSL_srp_server_param_with_username(SSL
*s
, int *ad
)
143 unsigned char b
[SSL_MAX_MASTER_KEY_LENGTH
];
146 *ad
= SSL_AD_UNKNOWN_PSK_IDENTITY
;
147 if ((s
->srp_ctx
.TLS_ext_srp_username_callback
!= NULL
) &&
149 s
->srp_ctx
.TLS_ext_srp_username_callback(s
, ad
,
150 s
->srp_ctx
.SRP_cb_arg
)) !=
154 *ad
= SSL_AD_INTERNAL_ERROR
;
155 if ((s
->srp_ctx
.N
== NULL
) ||
156 (s
->srp_ctx
.g
== NULL
) ||
157 (s
->srp_ctx
.s
== NULL
) || (s
->srp_ctx
.v
== NULL
))
158 return SSL3_AL_FATAL
;
160 if (RAND_priv_bytes(b
, sizeof(b
)) <= 0)
161 return SSL3_AL_FATAL
;
162 s
->srp_ctx
.b
= BN_bin2bn(b
, sizeof(b
), NULL
);
163 OPENSSL_cleanse(b
, sizeof(b
));
165 /* Calculate: B = (kv + g^b) % N */
167 return ((s
->srp_ctx
.B
=
168 SRP_Calc_B(s
->srp_ctx
.b
, s
->srp_ctx
.N
, s
->srp_ctx
.g
,
170 NULL
) ? SSL_ERROR_NONE
: SSL3_AL_FATAL
;
174 * If the server just has the raw password, make up a verifier entry on the
177 int SSL_set_srp_server_param_pw(SSL
*s
, const char *user
, const char *pass
,
180 SRP_gN
*GN
= SRP_get_default_gN(grp
);
183 s
->srp_ctx
.N
= BN_dup(GN
->N
);
184 s
->srp_ctx
.g
= BN_dup(GN
->g
);
185 BN_clear_free(s
->srp_ctx
.v
);
187 BN_clear_free(s
->srp_ctx
.s
);
189 if (!SRP_create_verifier_BN
190 (user
, pass
, &s
->srp_ctx
.s
, &s
->srp_ctx
.v
, GN
->N
, GN
->g
))
196 int SSL_set_srp_server_param(SSL
*s
, const BIGNUM
*N
, const BIGNUM
*g
,
197 BIGNUM
*sa
, BIGNUM
*v
, char *info
)
200 if (s
->srp_ctx
.N
!= NULL
) {
201 if (!BN_copy(s
->srp_ctx
.N
, N
)) {
202 BN_free(s
->srp_ctx
.N
);
206 s
->srp_ctx
.N
= BN_dup(N
);
209 if (s
->srp_ctx
.g
!= NULL
) {
210 if (!BN_copy(s
->srp_ctx
.g
, g
)) {
211 BN_free(s
->srp_ctx
.g
);
215 s
->srp_ctx
.g
= BN_dup(g
);
218 if (s
->srp_ctx
.s
!= NULL
) {
219 if (!BN_copy(s
->srp_ctx
.s
, sa
)) {
220 BN_free(s
->srp_ctx
.s
);
224 s
->srp_ctx
.s
= BN_dup(sa
);
227 if (s
->srp_ctx
.v
!= NULL
) {
228 if (!BN_copy(s
->srp_ctx
.v
, v
)) {
229 BN_free(s
->srp_ctx
.v
);
233 s
->srp_ctx
.v
= BN_dup(v
);
237 OPENSSL_free(s
->srp_ctx
.info
);
238 if ((s
->srp_ctx
.info
= BUF_strdup(info
)) == NULL
)
242 if (!(s
->srp_ctx
.N
) ||
243 !(s
->srp_ctx
.g
) || !(s
->srp_ctx
.s
) || !(s
->srp_ctx
.v
))
249 int srp_generate_server_master_secret(SSL
*s
)
251 BIGNUM
*K
= NULL
, *u
= NULL
;
252 int ret
= -1, tmp_len
= 0;
253 unsigned char *tmp
= NULL
;
255 if (!SRP_Verify_A_mod_N(s
->srp_ctx
.A
, s
->srp_ctx
.N
))
257 if ((u
= SRP_Calc_u(s
->srp_ctx
.A
, s
->srp_ctx
.B
, s
->srp_ctx
.N
)) == NULL
)
259 if ((K
= SRP_Calc_server_key(s
->srp_ctx
.A
, s
->srp_ctx
.v
, u
, s
->srp_ctx
.b
,
260 s
->srp_ctx
.N
)) == NULL
)
263 tmp_len
= BN_num_bytes(K
);
264 if ((tmp
= OPENSSL_malloc(tmp_len
)) == NULL
) {
265 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
266 SSL_F_SRP_GENERATE_SERVER_MASTER_SECRET
, ERR_R_MALLOC_FAILURE
);
270 /* Calls SSLfatal() as required */
271 ret
= ssl_generate_master_secret(s
, tmp
, tmp_len
, 1);
279 int srp_generate_client_master_secret(SSL
*s
)
281 BIGNUM
*x
= NULL
, *u
= NULL
, *K
= NULL
;
282 int ret
= -1, tmp_len
= 0;
284 unsigned char *tmp
= NULL
;
287 * Checks if b % n == 0
289 if (SRP_Verify_B_mod_N(s
->srp_ctx
.B
, s
->srp_ctx
.N
) == 0
290 || (u
= SRP_Calc_u(s
->srp_ctx
.A
, s
->srp_ctx
.B
, s
->srp_ctx
.N
))
292 || s
->srp_ctx
.SRP_give_srp_client_pwd_callback
== NULL
) {
293 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
294 SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET
, ERR_R_INTERNAL_ERROR
);
297 if ((passwd
= s
->srp_ctx
.SRP_give_srp_client_pwd_callback(s
,
298 s
->srp_ctx
.SRP_cb_arg
))
300 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
301 SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET
,
302 SSL_R_CALLBACK_FAILED
);
305 if ((x
= SRP_Calc_x(s
->srp_ctx
.s
, s
->srp_ctx
.login
, passwd
)) == NULL
306 || (K
= SRP_Calc_client_key(s
->srp_ctx
.N
, s
->srp_ctx
.B
,
308 s
->srp_ctx
.a
, u
)) == NULL
) {
309 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
310 SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET
, ERR_R_INTERNAL_ERROR
);
314 tmp_len
= BN_num_bytes(K
);
315 if ((tmp
= OPENSSL_malloc(tmp_len
)) == NULL
) {
316 SSLfatal(s
, SSL_AD_INTERNAL_ERROR
,
317 SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET
, ERR_R_MALLOC_FAILURE
);
321 /* Calls SSLfatal() as required */
322 ret
= ssl_generate_master_secret(s
, tmp
, tmp_len
, 1);
327 OPENSSL_clear_free(passwd
, strlen(passwd
));
332 int srp_verify_server_param(SSL
*s
)
334 SRP_CTX
*srp
= &s
->srp_ctx
;
336 * Sanity check parameters: we can quickly check B % N == 0 by checking B
339 if (BN_ucmp(srp
->g
, srp
->N
) >= 0 || BN_ucmp(srp
->B
, srp
->N
) >= 0
340 || BN_is_zero(srp
->B
)) {
341 SSLfatal(s
, SSL_AD_ILLEGAL_PARAMETER
, SSL_F_SRP_VERIFY_SERVER_PARAM
,
346 if (BN_num_bits(srp
->N
) < srp
->strength
) {
347 SSLfatal(s
, SSL_AD_INSUFFICIENT_SECURITY
, SSL_F_SRP_VERIFY_SERVER_PARAM
,
348 SSL_R_INSUFFICIENT_SECURITY
);
352 if (srp
->SRP_verify_param_callback
) {
353 if (srp
->SRP_verify_param_callback(s
, srp
->SRP_cb_arg
) <= 0) {
354 SSLfatal(s
, SSL_AD_INSUFFICIENT_SECURITY
,
355 SSL_F_SRP_VERIFY_SERVER_PARAM
,
356 SSL_R_CALLBACK_FAILED
);
359 } else if (!SRP_check_known_gN_param(srp
->g
, srp
->N
)) {
360 SSLfatal(s
, SSL_AD_INSUFFICIENT_SECURITY
, SSL_F_SRP_VERIFY_SERVER_PARAM
,
361 SSL_R_INSUFFICIENT_SECURITY
);
368 int SRP_Calc_A_param(SSL
*s
)
370 unsigned char rnd
[SSL_MAX_MASTER_KEY_LENGTH
];
372 if (RAND_priv_bytes(rnd
, sizeof(rnd
)) <= 0)
374 s
->srp_ctx
.a
= BN_bin2bn(rnd
, sizeof(rnd
), s
->srp_ctx
.a
);
375 OPENSSL_cleanse(rnd
, sizeof(rnd
));
377 if (!(s
->srp_ctx
.A
= SRP_Calc_A(s
->srp_ctx
.a
, s
->srp_ctx
.N
, s
->srp_ctx
.g
)))
383 BIGNUM
*SSL_get_srp_g(SSL
*s
)
385 if (s
->srp_ctx
.g
!= NULL
)
387 return s
->ctx
->srp_ctx
.g
;
390 BIGNUM
*SSL_get_srp_N(SSL
*s
)
392 if (s
->srp_ctx
.N
!= NULL
)
394 return s
->ctx
->srp_ctx
.N
;
397 char *SSL_get_srp_username(SSL
*s
)
399 if (s
->srp_ctx
.login
!= NULL
)
400 return s
->srp_ctx
.login
;
401 return s
->ctx
->srp_ctx
.login
;
404 char *SSL_get_srp_userinfo(SSL
*s
)
406 if (s
->srp_ctx
.info
!= NULL
)
407 return s
->srp_ctx
.info
;
408 return s
->ctx
->srp_ctx
.info
;
411 # define tls1_ctx_ctrl ssl3_ctx_ctrl
412 # define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
414 int SSL_CTX_set_srp_username(SSL_CTX
*ctx
, char *name
)
416 return tls1_ctx_ctrl(ctx
, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME
, 0, name
);
419 int SSL_CTX_set_srp_password(SSL_CTX
*ctx
, char *password
)
421 return tls1_ctx_ctrl(ctx
, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD
, 0, password
);
424 int SSL_CTX_set_srp_strength(SSL_CTX
*ctx
, int strength
)
426 return tls1_ctx_ctrl(ctx
, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH
, strength
,
430 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX
*ctx
,
431 int (*cb
) (SSL
*, void *))
433 return tls1_ctx_callback_ctrl(ctx
, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB
,
437 int SSL_CTX_set_srp_cb_arg(SSL_CTX
*ctx
, void *arg
)
439 return tls1_ctx_ctrl(ctx
, SSL_CTRL_SET_SRP_ARG
, 0, arg
);
442 int SSL_CTX_set_srp_username_callback(SSL_CTX
*ctx
,
443 int (*cb
) (SSL
*, int *, void *))
445 return tls1_ctx_callback_ctrl(ctx
, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB
,
449 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX
*ctx
,
450 char *(*cb
) (SSL
*, void *))
452 return tls1_ctx_callback_ctrl(ctx
, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB
,