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openssl/ssl/tls_srp.c
Matt Caswell dc84829cc5 Make sure we use the correct SSL object when making a callback 
When processing a callback within libssl that applies to TLS the original
SSL object may have been created for TLS directly, or for QUIC. When making
the callback we must make sure that we use the correct SSL object. In the
case of QUIC we must not use the internal only SSL object.

Fixes #25788

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25874)
2024-11-07 12:05:34 +01:00

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/*
* Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2004, EdelKey Project. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*
* Originally written by Christophe Renou and Peter Sylvester,
* for the EdelKey project.
*/
/*
* We need to use the SRP deprecated APIs in order to implement the SSL SRP
* APIs - which are themselves deprecated.
*/
#define OPENSSL_SUPPRESS_DEPRECATED
#include <openssl/crypto.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include "ssl_local.h"
#ifndef OPENSSL_NO_SRP
# include <openssl/srp.h>
/*
* The public API SSL_CTX_SRP_CTX_free() is deprecated so we use
* ssl_ctx_srp_ctx_free_intern() internally.
*/
int ssl_ctx_srp_ctx_free_intern(SSL_CTX *ctx)
{
if (ctx == NULL)
return 0;
OPENSSL_free(ctx->srp_ctx.login);
OPENSSL_free(ctx->srp_ctx.info);
BN_free(ctx->srp_ctx.N);
BN_free(ctx->srp_ctx.g);
BN_free(ctx->srp_ctx.s);
BN_free(ctx->srp_ctx.B);
BN_free(ctx->srp_ctx.A);
BN_free(ctx->srp_ctx.a);
BN_free(ctx->srp_ctx.b);
BN_free(ctx->srp_ctx.v);
memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
ctx->srp_ctx.strength = SRP_MINIMAL_N;
return 1;
}
int SSL_CTX_SRP_CTX_free(SSL_CTX *ctx)
{
return ssl_ctx_srp_ctx_free_intern(ctx);
}
/*
* The public API SSL_SRP_CTX_free() is deprecated so we use
* ssl_srp_ctx_free_intern() internally.
*/
int ssl_srp_ctx_free_intern(SSL_CONNECTION *s)
{
if (s == NULL)
return 0;
OPENSSL_free(s->srp_ctx.login);
OPENSSL_free(s->srp_ctx.info);
BN_free(s->srp_ctx.N);
BN_free(s->srp_ctx.g);
BN_free(s->srp_ctx.s);
BN_free(s->srp_ctx.B);
BN_free(s->srp_ctx.A);
BN_free(s->srp_ctx.a);
BN_free(s->srp_ctx.b);
BN_free(s->srp_ctx.v);
memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
s->srp_ctx.strength = SRP_MINIMAL_N;
return 1;
}
int SSL_SRP_CTX_free(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
/* the call works with NULL sc */
return ssl_srp_ctx_free_intern(sc);
}
/*
* The public API SSL_SRP_CTX_init() is deprecated so we use
* ssl_srp_ctx_init_intern() internally.
*/
int ssl_srp_ctx_init_intern(SSL_CONNECTION *s)
{
SSL_CTX *ctx;
if (s == NULL || (ctx = SSL_CONNECTION_GET_CTX(s)) == NULL)
return 0;
memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
/* set client Hello login callback */
s->srp_ctx.TLS_ext_srp_username_callback =
ctx->srp_ctx.TLS_ext_srp_username_callback;
/* set SRP N/g param callback for verification */
s->srp_ctx.SRP_verify_param_callback =
ctx->srp_ctx.SRP_verify_param_callback;
/* set SRP client passwd callback */
s->srp_ctx.SRP_give_srp_client_pwd_callback =
ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
s->srp_ctx.strength = ctx->srp_ctx.strength;
if (((ctx->srp_ctx.N != NULL) &&
((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
((ctx->srp_ctx.g != NULL) &&
((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
((ctx->srp_ctx.s != NULL) &&
((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
((ctx->srp_ctx.B != NULL) &&
((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
((ctx->srp_ctx.A != NULL) &&
((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
((ctx->srp_ctx.a != NULL) &&
((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
((ctx->srp_ctx.v != NULL) &&
((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
((ctx->srp_ctx.b != NULL) &&
((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) {
ERR_raise(ERR_LIB_SSL, ERR_R_BN_LIB);
goto err;
}
if ((ctx->srp_ctx.login != NULL) &&
((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) {
ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
if ((ctx->srp_ctx.info != NULL) &&
((s->srp_ctx.info = OPENSSL_strdup(ctx->srp_ctx.info)) == NULL)) {
ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
return 1;
err:
OPENSSL_free(s->srp_ctx.login);
OPENSSL_free(s->srp_ctx.info);
BN_free(s->srp_ctx.N);
BN_free(s->srp_ctx.g);
BN_free(s->srp_ctx.s);
BN_free(s->srp_ctx.B);
BN_free(s->srp_ctx.A);
BN_free(s->srp_ctx.a);
BN_free(s->srp_ctx.b);
BN_free(s->srp_ctx.v);
memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
return 0;
}
int SSL_SRP_CTX_init(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
/* the call works with NULL sc */
return ssl_srp_ctx_init_intern(sc);
}
/*
* The public API SSL_CTX_SRP_CTX_init() is deprecated so we use
* ssl_ctx_srp_ctx_init_intern() internally.
*/
int ssl_ctx_srp_ctx_init_intern(SSL_CTX *ctx)
{
if (ctx == NULL)
return 0;
memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
ctx->srp_ctx.strength = SRP_MINIMAL_N;
return 1;
}
int SSL_CTX_SRP_CTX_init(SSL_CTX *ctx)
{
return ssl_ctx_srp_ctx_init_intern(ctx);
}
/* server side */
/*
* The public API SSL_srp_server_param_with_username() is deprecated so we use
* ssl_srp_server_param_with_username_intern() internally.
*/
int ssl_srp_server_param_with_username_intern(SSL_CONNECTION *s, int *ad)
{
unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
int al;
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
*ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) &&
((al =
s->srp_ctx.TLS_ext_srp_username_callback(SSL_CONNECTION_GET_USER_SSL(s),
ad,
s->srp_ctx.SRP_cb_arg)) !=
SSL_ERROR_NONE))
return al;
*ad = SSL_AD_INTERNAL_ERROR;
if ((s->srp_ctx.N == NULL) ||
(s->srp_ctx.g == NULL) ||
(s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL))
return SSL3_AL_FATAL;
if (RAND_priv_bytes_ex(SSL_CONNECTION_GET_CTX(s)->libctx, b, sizeof(b),
0) <= 0)
return SSL3_AL_FATAL;
s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL);
OPENSSL_cleanse(b, sizeof(b));
/* Calculate: B = (kv + g^b) % N */
return ((s->srp_ctx.B =
SRP_Calc_B_ex(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
s->srp_ctx.v, sctx->libctx, sctx->propq)) !=
NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
}
int SSL_srp_server_param_with_username(SSL *s, int *ad)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return SSL3_AL_FATAL;
return ssl_srp_server_param_with_username_intern(sc, ad);
}
/*
* If the server just has the raw password, make up a verifier entry on the
* fly
*/
int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
const char *grp)
{
SRP_gN *GN;
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return -1;
GN = SRP_get_default_gN(grp);
if (GN == NULL)
return -1;
sc->srp_ctx.N = BN_dup(GN->N);
sc->srp_ctx.g = BN_dup(GN->g);
BN_clear_free(sc->srp_ctx.v);
sc->srp_ctx.v = NULL;
BN_clear_free(sc->srp_ctx.s);
sc->srp_ctx.s = NULL;
if (!SRP_create_verifier_BN_ex(user, pass, &sc->srp_ctx.s, &sc->srp_ctx.v,
sc->srp_ctx.N, sc->srp_ctx.g, s->ctx->libctx,
s->ctx->propq))
return -1;
return 1;
}
int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
BIGNUM *sa, BIGNUM *v, char *info)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return -1;
if (N != NULL) {
if (sc->srp_ctx.N != NULL) {
if (!BN_copy(sc->srp_ctx.N, N)) {
BN_free(sc->srp_ctx.N);
sc->srp_ctx.N = NULL;
}
} else
sc->srp_ctx.N = BN_dup(N);
}
if (g != NULL) {
if (sc->srp_ctx.g != NULL) {
if (!BN_copy(sc->srp_ctx.g, g)) {
BN_free(sc->srp_ctx.g);
sc->srp_ctx.g = NULL;
}
} else
sc->srp_ctx.g = BN_dup(g);
}
if (sa != NULL) {
if (sc->srp_ctx.s != NULL) {
if (!BN_copy(sc->srp_ctx.s, sa)) {
BN_free(sc->srp_ctx.s);
sc->srp_ctx.s = NULL;
}
} else
sc->srp_ctx.s = BN_dup(sa);
}
if (v != NULL) {
if (sc->srp_ctx.v != NULL) {
if (!BN_copy(sc->srp_ctx.v, v)) {
BN_free(sc->srp_ctx.v);
sc->srp_ctx.v = NULL;
}
} else
sc->srp_ctx.v = BN_dup(v);
}
if (info != NULL) {
if (sc->srp_ctx.info)
OPENSSL_free(sc->srp_ctx.info);
if ((sc->srp_ctx.info = OPENSSL_strdup(info)) == NULL)
return -1;
}
if (!(sc->srp_ctx.N) ||
!(sc->srp_ctx.g) || !(sc->srp_ctx.s) || !(sc->srp_ctx.v))
return -1;
return 1;
}
int srp_generate_server_master_secret(SSL_CONNECTION *s)
{
BIGNUM *K = NULL, *u = NULL;
int ret = 0, tmp_len = 0;
unsigned char *tmp = NULL;
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N))
goto err;
if ((u = SRP_Calc_u_ex(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N,
sctx->libctx, sctx->propq)) == NULL)
goto err;
if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
s->srp_ctx.N)) == NULL)
goto err;
tmp_len = BN_num_bytes(K);
if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
goto err;
}
BN_bn2bin(K, tmp);
/* Calls SSLfatal() as required */
ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
err:
BN_clear_free(K);
BN_clear_free(u);
return ret;
}
/* client side */
int srp_generate_client_master_secret(SSL_CONNECTION *s)
{
BIGNUM *x = NULL, *u = NULL, *K = NULL;
int ret = 0, tmp_len = 0;
char *passwd = NULL;
unsigned char *tmp = NULL;
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
/*
* Checks if b % n == 0
*/
if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0
|| (u = SRP_Calc_u_ex(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N,
sctx->libctx, sctx->propq))
== NULL
|| s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
if ((passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(SSL_CONNECTION_GET_USER_SSL(s),
s->srp_ctx.SRP_cb_arg))
== NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CALLBACK_FAILED);
goto err;
}
if ((x = SRP_Calc_x_ex(s->srp_ctx.s, s->srp_ctx.login, passwd,
sctx->libctx, sctx->propq)) == NULL
|| (K = SRP_Calc_client_key_ex(s->srp_ctx.N, s->srp_ctx.B,
s->srp_ctx.g, x,
s->srp_ctx.a, u,
sctx->libctx,
sctx->propq)) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
tmp_len = BN_num_bytes(K);
if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
goto err;
}
BN_bn2bin(K, tmp);
/* Calls SSLfatal() as required */
ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
err:
BN_clear_free(K);
BN_clear_free(x);
if (passwd != NULL)
OPENSSL_clear_free(passwd, strlen(passwd));
BN_clear_free(u);
return ret;
}
int srp_verify_server_param(SSL_CONNECTION *s)
{
SRP_CTX *srp = &s->srp_ctx;
/*
* Sanity check parameters: we can quickly check B % N == 0 by checking B
* != 0 since B < N
*/
if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0
|| BN_is_zero(srp->B)) {
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_DATA);
return 0;
}
if (BN_num_bits(srp->N) < srp->strength) {
SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_R_INSUFFICIENT_SECURITY);
return 0;
}
if (srp->SRP_verify_param_callback) {
if (srp->SRP_verify_param_callback(SSL_CONNECTION_GET_USER_SSL(s),
srp->SRP_cb_arg) <= 0) {
SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_R_CALLBACK_FAILED);
return 0;
}
} else if (!SRP_check_known_gN_param(srp->g, srp->N)) {
SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY,
SSL_R_INSUFFICIENT_SECURITY);
return 0;
}
return 1;
}
/*
* The public API SRP_Calc_A_param() is deprecated so we use
* ssl_srp_calc_a_param_intern() internally.
*/
int ssl_srp_calc_a_param_intern(SSL_CONNECTION *s)
{
unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
if (RAND_priv_bytes_ex(SSL_CONNECTION_GET_CTX(s)->libctx,
rnd, sizeof(rnd), 0) <= 0)
return 0;
s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
OPENSSL_cleanse(rnd, sizeof(rnd));
if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g)))
return 0;
return 1;
}
int SRP_Calc_A_param(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return 0;
return ssl_srp_calc_a_param_intern(sc);
}
BIGNUM *SSL_get_srp_g(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return NULL;
if (sc->srp_ctx.g != NULL)
return sc->srp_ctx.g;
return s->ctx->srp_ctx.g;
}
BIGNUM *SSL_get_srp_N(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return NULL;
if (sc->srp_ctx.N != NULL)
return sc->srp_ctx.N;
return s->ctx->srp_ctx.N;
}
char *SSL_get_srp_username(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return NULL;
if (sc->srp_ctx.login != NULL)
return sc->srp_ctx.login;
return s->ctx->srp_ctx.login;
}
char *SSL_get_srp_userinfo(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
if (sc == NULL)
return NULL;
if (sc->srp_ctx.info != NULL)
return sc->srp_ctx.info;
return s->ctx->srp_ctx.info;
}
# define tls1_ctx_ctrl ssl3_ctx_ctrl
# define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name)
{
return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name);
}
int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password)
{
return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password);
}
int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
{
return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
NULL);
}
int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
int (*cb) (SSL *, void *))
{
return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
(void (*)(void))cb);
}
int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
{
return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg);
}
int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
int (*cb) (SSL *, int *, void *))
{
return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
(void (*)(void))cb);
}
int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
char *(*cb) (SSL *, void *))
{
return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,
(void (*)(void))cb);
}
#endif
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