Add SRP support.
diff --git a/apps/s_client.c b/apps/s_client.c
index 8cd5a38..5e2a5ef 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -163,6 +163,9 @@
#include <openssl/rand.h>
#include <openssl/ocsp.h>
#include <openssl/bn.h>
+#ifndef OPENSSL_NO_SRP
+#include <openssl/srp.h>
+#endif
#include "s_apps.h"
#include "timeouts.h"
@@ -316,6 +319,13 @@
BIO_printf(bio_err," -jpake arg - JPAKE secret to use\n");
# endif
#endif
+#ifndef OPENSSL_NO_SRP
+ BIO_printf(bio_err," -srpuser user - SRP authentification for 'user'\n");
+ BIO_printf(bio_err," -srppass arg - password for 'user'\n");
+ BIO_printf(bio_err," -srp_lateuser - SRP username into second ClientHello message\n");
+ BIO_printf(bio_err," -srp_moregroups - Tolerate other than the known g N values.\n");
+ BIO_printf(bio_err," -srp_strength int - minimal mength in bits for N (default %d).\n",SRP_MINIMAL_N);
+#endif
BIO_printf(bio_err," -ssl2 - just use SSLv2\n");
BIO_printf(bio_err," -ssl3 - just use SSLv3\n");
BIO_printf(bio_err," -tls1_1 - just use TLSv1.1\n");
@@ -371,6 +381,112 @@
return SSL_TLSEXT_ERR_OK;
}
+#ifndef OPENSSL_NO_SRP
+
+/* This is a context that we pass to all callbacks */
+typedef struct srp_arg_st
+ {
+ char *srppassin;
+ char *srplogin;
+ int msg; /* copy from c_msg */
+ int debug; /* copy from c_debug */
+ int amp; /* allow more groups */
+ int strength /* minimal size for N */ ;
+ } SRP_ARG;
+
+#define SRP_NUMBER_ITERATIONS_FOR_PRIME 64
+
+static int SRP_Verify_N_and_g(const BIGNUM *N, const BIGNUM *g)
+ {
+ BN_CTX *bn_ctx = BN_CTX_new();
+ BIGNUM *p = BN_new();
+ BIGNUM *r = BN_new();
+ int ret =
+ g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&
+ BN_is_prime(N,SRP_NUMBER_ITERATIONS_FOR_PRIME,NULL,bn_ctx,NULL) &&
+ p != NULL && BN_rshift1(p, N) &&
+
+ /* p = (N-1)/2 */
+ BN_is_prime(p,SRP_NUMBER_ITERATIONS_FOR_PRIME,NULL,bn_ctx,NULL) &&
+ r != NULL &&
+
+ /* verify g^((N-1)/2) == -1 (mod N) */
+ BN_mod_exp(r, g, p, N, bn_ctx) &&
+ BN_add_word(r, 1) &&
+ BN_cmp(r, N) == 0;
+
+ if(r)
+ BN_free(r);
+ if(p)
+ BN_free(p);
+ if(bn_ctx)
+ BN_CTX_free(bn_ctx);
+ return ret;
+ }
+
+static int MS_CALLBACK ssl_srp_verify_param_cb(SSL *s, void *arg)
+ {
+ SRP_ARG *srp_arg = (SRP_ARG *)arg;
+ BIGNUM *N = NULL, *g = NULL;
+ if (!(N = SSL_get_srp_N(s)) || !(g = SSL_get_srp_g(s)))
+ return 0;
+ if (srp_arg->debug || srp_arg->msg || srp_arg->amp == 1)
+ {
+ BIO_printf(bio_err, "SRP parameters:\n");
+ BIO_printf(bio_err,"\tN="); BN_print(bio_err,N);
+ BIO_printf(bio_err,"\n\tg="); BN_print(bio_err,g);
+ BIO_printf(bio_err,"\n");
+ }
+
+ if (SRP_check_known_gN_param(g,N))
+ return 1;
+
+ if (srp_arg->amp == 1)
+ {
+ if (srp_arg->debug)
+ BIO_printf(bio_err, "SRP param N and g are not known params, going to check deeper.\n");
+
+/* The srp_moregroups must be used with caution, testing primes costs time.
+ Implementors should rather add the value to the known ones.
+ The minimal size has already been tested.
+*/
+ if (BN_num_bits(g) <= BN_BITS && SRP_Verify_N_and_g(N,g))
+ return 1;
+ }
+ BIO_printf(bio_err, "SRP param N and g rejected.\n");
+ return 0;
+ }
+
+#define PWD_STRLEN 1024
+
+static char * MS_CALLBACK ssl_give_srp_client_pwd_cb(SSL *s, void *arg)
+ {
+ SRP_ARG *srp_arg = (SRP_ARG *)arg;
+ char *pass = (char *)OPENSSL_malloc(PWD_STRLEN+1);
+ PW_CB_DATA cb_tmp;
+ int l;
+
+ cb_tmp.password = (char *)srp_arg->srppassin;
+ cb_tmp.prompt_info = "SRP user";
+ if ((l = password_callback(pass, PWD_STRLEN, 0, &cb_tmp))<0)
+ {
+ BIO_printf (bio_err, "Can't read Password\n");
+ OPENSSL_free(pass);
+ return NULL;
+ }
+ *(pass+l)= '\0';
+
+ return pass;
+ }
+
+static char * MS_CALLBACK missing_srp_username_callback(SSL *s, void *arg)
+ {
+ SRP_ARG *srp_arg = (SRP_ARG *)arg;
+ return BUF_strdup(srp_arg->srplogin);
+ }
+
+#endif
+
# ifndef OPENSSL_NO_NEXTPROTONEG
/* This the context that we pass to next_proto_cb */
typedef struct tlsextnextprotoctx_st {
@@ -480,6 +596,11 @@
#ifndef OPENSSL_NO_JPAKE
char *jpake_secret = NULL;
#endif
+#ifndef OPENSSL_NO_SRP
+ char * srppass = NULL;
+ int srp_lateuser = 0;
+ SRP_ARG srp_arg = {NULL,NULL,0,0,0,1024};
+#endif
#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
meth=SSLv23_client_method();
@@ -629,6 +750,37 @@
}
}
#endif
+#ifndef OPENSSL_NO_SRP
+ else if (strcmp(*argv,"-srpuser") == 0)
+ {
+ if (--argc < 1) goto bad;
+ srp_arg.srplogin= *(++argv);
+ meth=TLSv1_client_method();
+ }
+ else if (strcmp(*argv,"-srppass") == 0)
+ {
+ if (--argc < 1) goto bad;
+ srppass= *(++argv);
+ meth=TLSv1_client_method();
+ }
+ else if (strcmp(*argv,"-srp_strength") == 0)
+ {
+ if (--argc < 1) goto bad;
+ srp_arg.strength=atoi(*(++argv));
+ BIO_printf(bio_err,"SRP minimal length for N is %d\n",srp_arg.strength);
+ meth=TLSv1_client_method();
+ }
+ else if (strcmp(*argv,"-srp_lateuser") == 0)
+ {
+ srp_lateuser= 1;
+ meth=TLSv1_client_method();
+ }
+ else if (strcmp(*argv,"-srp_moregroups") == 0)
+ {
+ srp_arg.amp=1;
+ meth=TLSv1_client_method();
+ }
+#endif
#ifndef OPENSSL_NO_SSL2
else if (strcmp(*argv,"-ssl2") == 0)
meth=SSLv2_client_method();
@@ -902,6 +1054,14 @@
}
}
+#ifndef OPENSSL_NO_SRP
+ if(!app_passwd(bio_err, srppass, NULL, &srp_arg.srppassin, NULL))
+ {
+ BIO_printf(bio_err, "Error getting password\n");
+ goto end;
+ }
+#endif
+
ctx=SSL_CTX_new(meth);
if (ctx == NULL)
{
@@ -986,6 +1146,26 @@
SSL_CTX_set_tlsext_servername_callback(ctx, ssl_servername_cb);
SSL_CTX_set_tlsext_servername_arg(ctx, &tlsextcbp);
}
+#ifndef OPENSSL_NO_SRP
+ if (srp_arg.srplogin)
+ {
+ if (srp_lateuser)
+ SSL_CTX_set_srp_missing_srp_username_callback(ctx,missing_srp_username_callback);
+ else if (!SSL_CTX_set_srp_username(ctx, srp_arg.srplogin))
+ {
+ BIO_printf(bio_err,"Unable to set SRP username\n");
+ goto end;
+ }
+ srp_arg.msg = c_msg;
+ srp_arg.debug = c_debug ;
+ SSL_CTX_set_srp_cb_arg(ctx,&srp_arg);
+ SSL_CTX_set_srp_client_pwd_callback(ctx, ssl_give_srp_client_pwd_cb);
+ SSL_CTX_set_srp_strength(ctx, srp_arg.strength);
+ if (c_msg || c_debug || srp_arg.amp == 0)
+ SSL_CTX_set_srp_verify_param_callback(ctx, ssl_srp_verify_param_cb);
+ }
+
+#endif
#endif
con=SSL_new(ctx);
