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source: vbox/trunk/src/libs/openssl-1.1.0g/ssl/tls_srp.c@ 69890

Last change on this file since 69890 was 69890, checked in by vboxsync, 7 years ago

Added OpenSSL 1.1.0g with unneeded files removed, otherwise unmodified.
bugref:8070: src/libs maintenance
  • Property svn:eol-style set to native
File size: 12.0 KB
Line 
1/*
2 * Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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#include <openssl/crypto.h>
11#include <openssl/rand.h>
12#include <openssl/err.h>
13#include "ssl_locl.h"
14
15#ifndef OPENSSL_NO_SRP
16# include <openssl/srp.h>
17
18int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st *ctx)
19{
20 if (ctx == NULL)
21 return 0;
22 OPENSSL_free(ctx->srp_ctx.login);
23 OPENSSL_free(ctx->srp_ctx.info);
24 BN_free(ctx->srp_ctx.N);
25 BN_free(ctx->srp_ctx.g);
26 BN_free(ctx->srp_ctx.s);
27 BN_free(ctx->srp_ctx.B);
28 BN_free(ctx->srp_ctx.A);
29 BN_free(ctx->srp_ctx.a);
30 BN_free(ctx->srp_ctx.b);
31 BN_free(ctx->srp_ctx.v);
32 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
33 ctx->srp_ctx.strength = SRP_MINIMAL_N;
34 return (1);
35}
36
37int SSL_SRP_CTX_free(struct ssl_st *s)
38{
39 if (s == NULL)
40 return 0;
41 OPENSSL_free(s->srp_ctx.login);
42 OPENSSL_free(s->srp_ctx.info);
43 BN_free(s->srp_ctx.N);
44 BN_free(s->srp_ctx.g);
45 BN_free(s->srp_ctx.s);
46 BN_free(s->srp_ctx.B);
47 BN_free(s->srp_ctx.A);
48 BN_free(s->srp_ctx.a);
49 BN_free(s->srp_ctx.b);
50 BN_free(s->srp_ctx.v);
51 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
52 s->srp_ctx.strength = SRP_MINIMAL_N;
53 return (1);
54}
55
56int SSL_SRP_CTX_init(struct ssl_st *s)
57{
58 SSL_CTX *ctx;
59
60 if ((s == NULL) || ((ctx = s->ctx) == NULL))
61 return 0;
62
63 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
64
65 s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
66 /* set client Hello login callback */
67 s->srp_ctx.TLS_ext_srp_username_callback =
68 ctx->srp_ctx.TLS_ext_srp_username_callback;
69 /* set SRP N/g param callback for verification */
70 s->srp_ctx.SRP_verify_param_callback =
71 ctx->srp_ctx.SRP_verify_param_callback;
72 /* set SRP client passwd callback */
73 s->srp_ctx.SRP_give_srp_client_pwd_callback =
74 ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
75
76 s->srp_ctx.strength = ctx->srp_ctx.strength;
77
78 if (((ctx->srp_ctx.N != NULL) &&
79 ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
80 ((ctx->srp_ctx.g != NULL) &&
81 ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
82 ((ctx->srp_ctx.s != NULL) &&
83 ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
84 ((ctx->srp_ctx.B != NULL) &&
85 ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
86 ((ctx->srp_ctx.A != NULL) &&
87 ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
88 ((ctx->srp_ctx.a != NULL) &&
89 ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
90 ((ctx->srp_ctx.v != NULL) &&
91 ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
92 ((ctx->srp_ctx.b != NULL) &&
93 ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) {
94 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_BN_LIB);
95 goto err;
96 }
97 if ((ctx->srp_ctx.login != NULL) &&
98 ((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) {
99 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR);
100 goto err;
101 }
102 if ((ctx->srp_ctx.info != NULL) &&
103 ((s->srp_ctx.info = BUF_strdup(ctx->srp_ctx.info)) == NULL)) {
104 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR);
105 goto err;
106 }
107 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
108
109 return (1);
110 err:
111 OPENSSL_free(s->srp_ctx.login);
112 OPENSSL_free(s->srp_ctx.info);
113 BN_free(s->srp_ctx.N);
114 BN_free(s->srp_ctx.g);
115 BN_free(s->srp_ctx.s);
116 BN_free(s->srp_ctx.B);
117 BN_free(s->srp_ctx.A);
118 BN_free(s->srp_ctx.a);
119 BN_free(s->srp_ctx.b);
120 BN_free(s->srp_ctx.v);
121 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
122 return (0);
123}
124
125int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
126{
127 if (ctx == NULL)
128 return 0;
129
130 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
131 ctx->srp_ctx.strength = SRP_MINIMAL_N;
132
133 return (1);
134}
135
136/* server side */
137int SSL_srp_server_param_with_username(SSL *s, int *ad)
138{
139 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
140 int al;
141
142 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
143 if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) &&
144 ((al =
145 s->srp_ctx.TLS_ext_srp_username_callback(s, ad,
146 s->srp_ctx.SRP_cb_arg)) !=
147 SSL_ERROR_NONE))
148 return al;
149
150 *ad = SSL_AD_INTERNAL_ERROR;
151 if ((s->srp_ctx.N == NULL) ||
152 (s->srp_ctx.g == NULL) ||
153 (s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL))
154 return SSL3_AL_FATAL;
155
156 if (RAND_bytes(b, sizeof(b)) <= 0)
157 return SSL3_AL_FATAL;
158 s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL);
159 OPENSSL_cleanse(b, sizeof(b));
160
161 /* Calculate: B = (kv + g^b) % N */
162
163 return ((s->srp_ctx.B =
164 SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
165 s->srp_ctx.v)) !=
166 NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
167}
168
169/*
170 * If the server just has the raw password, make up a verifier entry on the
171 * fly
172 */
173int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
174 const char *grp)
175{
176 SRP_gN *GN = SRP_get_default_gN(grp);
177 if (GN == NULL)
178 return -1;
179 s->srp_ctx.N = BN_dup(GN->N);
180 s->srp_ctx.g = BN_dup(GN->g);
181 BN_clear_free(s->srp_ctx.v);
182 s->srp_ctx.v = NULL;
183 BN_clear_free(s->srp_ctx.s);
184 s->srp_ctx.s = NULL;
185 if (!SRP_create_verifier_BN
186 (user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g))
187 return -1;
188
189 return 1;
190}
191
192int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
193 BIGNUM *sa, BIGNUM *v, char *info)
194{
195 if (N != NULL) {
196 if (s->srp_ctx.N != NULL) {
197 if (!BN_copy(s->srp_ctx.N, N)) {
198 BN_free(s->srp_ctx.N);
199 s->srp_ctx.N = NULL;
200 }
201 } else
202 s->srp_ctx.N = BN_dup(N);
203 }
204 if (g != NULL) {
205 if (s->srp_ctx.g != NULL) {
206 if (!BN_copy(s->srp_ctx.g, g)) {
207 BN_free(s->srp_ctx.g);
208 s->srp_ctx.g = NULL;
209 }
210 } else
211 s->srp_ctx.g = BN_dup(g);
212 }
213 if (sa != NULL) {
214 if (s->srp_ctx.s != NULL) {
215 if (!BN_copy(s->srp_ctx.s, sa)) {
216 BN_free(s->srp_ctx.s);
217 s->srp_ctx.s = NULL;
218 }
219 } else
220 s->srp_ctx.s = BN_dup(sa);
221 }
222 if (v != NULL) {
223 if (s->srp_ctx.v != NULL) {
224 if (!BN_copy(s->srp_ctx.v, v)) {
225 BN_free(s->srp_ctx.v);
226 s->srp_ctx.v = NULL;
227 }
228 } else
229 s->srp_ctx.v = BN_dup(v);
230 }
231 if (info != NULL) {
232 if (s->srp_ctx.info)
233 OPENSSL_free(s->srp_ctx.info);
234 if ((s->srp_ctx.info = BUF_strdup(info)) == NULL)
235 return -1;
236 }
237
238 if (!(s->srp_ctx.N) ||
239 !(s->srp_ctx.g) || !(s->srp_ctx.s) || !(s->srp_ctx.v))
240 return -1;
241
242 return 1;
243}
244
245int srp_generate_server_master_secret(SSL *s)
246{
247 BIGNUM *K = NULL, *u = NULL;
248 int ret = -1, tmp_len = 0;
249 unsigned char *tmp = NULL;
250
251 if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N))
252 goto err;
253 if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL)
254 goto err;
255 if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
256 s->srp_ctx.N)) == NULL)
257 goto err;
258
259 tmp_len = BN_num_bytes(K);
260 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
261 goto err;
262 BN_bn2bin(K, tmp);
263 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
264 err:
265 BN_clear_free(K);
266 BN_clear_free(u);
267 return ret;
268}
269
270/* client side */
271int srp_generate_client_master_secret(SSL *s)
272{
273 BIGNUM *x = NULL, *u = NULL, *K = NULL;
274 int ret = -1, tmp_len = 0;
275 char *passwd = NULL;
276 unsigned char *tmp = NULL;
277
278 /*
279 * Checks if b % n == 0
280 */
281 if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0)
282 goto err;
283 if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL)
284 goto err;
285 if (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL)
286 goto err;
287 if (!
288 (passwd =
289 s->srp_ctx.SRP_give_srp_client_pwd_callback(s, s->srp_ctx.SRP_cb_arg)))
290 goto err;
291 if ((x = SRP_Calc_x(s->srp_ctx.s, s->srp_ctx.login, passwd)) == NULL)
292 goto err;
293 if ((K = SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, s->srp_ctx.g, x,
294 s->srp_ctx.a, u)) == NULL)
295 goto err;
296
297 tmp_len = BN_num_bytes(K);
298 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
299 goto err;
300 BN_bn2bin(K, tmp);
301 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
302 err:
303 BN_clear_free(K);
304 BN_clear_free(x);
305 if (passwd != NULL)
306 OPENSSL_clear_free(passwd, strlen(passwd));
307 BN_clear_free(u);
308 return ret;
309}
310
311int srp_verify_server_param(SSL *s, int *al)
312{
313 SRP_CTX *srp = &s->srp_ctx;
314 /*
315 * Sanity check parameters: we can quickly check B % N == 0 by checking B
316 * != 0 since B < N
317 */
318 if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0
319 || BN_is_zero(srp->B)) {
320 *al = SSL3_AD_ILLEGAL_PARAMETER;
321 return 0;
322 }
323
324 if (BN_num_bits(srp->N) < srp->strength) {
325 *al = TLS1_AD_INSUFFICIENT_SECURITY;
326 return 0;
327 }
328
329 if (srp->SRP_verify_param_callback) {
330 if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) {
331 *al = TLS1_AD_INSUFFICIENT_SECURITY;
332 return 0;
333 }
334 } else if (!SRP_check_known_gN_param(srp->g, srp->N)) {
335 *al = TLS1_AD_INSUFFICIENT_SECURITY;
336 return 0;
337 }
338
339 return 1;
340}
341
342int SRP_Calc_A_param(SSL *s)
343{
344 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
345
346 if (RAND_bytes(rnd, sizeof(rnd)) <= 0)
347 return 0;
348 s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
349 OPENSSL_cleanse(rnd, sizeof(rnd));
350
351 if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g)))
352 return 0;
353
354 return 1;
355}
356
357BIGNUM *SSL_get_srp_g(SSL *s)
358{
359 if (s->srp_ctx.g != NULL)
360 return s->srp_ctx.g;
361 return s->ctx->srp_ctx.g;
362}
363
364BIGNUM *SSL_get_srp_N(SSL *s)
365{
366 if (s->srp_ctx.N != NULL)
367 return s->srp_ctx.N;
368 return s->ctx->srp_ctx.N;
369}
370
371char *SSL_get_srp_username(SSL *s)
372{
373 if (s->srp_ctx.login != NULL)
374 return s->srp_ctx.login;
375 return s->ctx->srp_ctx.login;
376}
377
378char *SSL_get_srp_userinfo(SSL *s)
379{
380 if (s->srp_ctx.info != NULL)
381 return s->srp_ctx.info;
382 return s->ctx->srp_ctx.info;
383}
384
385# define tls1_ctx_ctrl ssl3_ctx_ctrl
386# define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
387
388int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name)
389{
390 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name);
391}
392
393int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password)
394{
395 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password);
396}
397
398int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
399{
400 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
401 NULL);
402}
403
404int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
405 int (*cb) (SSL *, void *))
406{
407 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
408 (void (*)(void))cb);
409}
410
411int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
412{
413 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg);
414}
415
416int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
417 int (*cb) (SSL *, int *, void *))
418{
419 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
420 (void (*)(void))cb);
421}
422
423int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
424 char *(*cb) (SSL *, void *))
425{
426 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,
427 (void (*)(void))cb);
428}
429
430#endif
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