Fixed out-of-bounds read errors in ssl3_get_key_exchange.

PR#3450

Conflicts:
	ssl/s3_clnt.c

Reviewed-by: Emilia Käsper <emilia@openssl.org>

diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index acf2471a1fc78dd9be8b0f6e54005366eecb8118..db68bed5fe1209bc7c07527fe7a37861a4820b2e 100644 (file)
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -1174,8 +1174,8 @@ int ssl3_get_key_exchange(SSL *s)
 #endif
        EVP_MD_CTX md_ctx;
        unsigned char *param,*p;
-       int al,i,j,param_len,ok;
-       long n,alg_k,alg_a;
+       int al,j,ok;
+       long i,param_len,n,alg_k,alg_a;
        EVP_PKEY *pkey=NULL;
 #ifndef OPENSSL_NO_RSA
        RSA *rsa=NULL;
@@ -1250,36 +1250,48 @@ int ssl3_get_key_exchange(SSL *s)
                s->session->sess_cert=ssl_sess_cert_new();
                }
 
+       /* Total length of the parameters including the length prefix */
        param_len=0;
+
        alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
        alg_a=s->s3->tmp.new_cipher->algorithm_auth;
        EVP_MD_CTX_init(&md_ctx);
 
+       al=SSL_AD_DECODE_ERROR;
+
 #ifndef OPENSSL_NO_PSK
        if (alg_k & SSL_kPSK)
                {
                char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
 
-               al=SSL_AD_HANDSHAKE_FAILURE;
+               param_len = 2;
+               if (param_len > n)
+                       {
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
                n2s(p,i);
-               param_len=i+2;
+
                /* Store PSK identity hint for later use, hint is used
                 * in ssl3_send_client_key_exchange.  Assume that the
                 * maximum length of a PSK identity hint can be as
                 * long as the maximum length of a PSK identity. */
                if (i > PSK_MAX_IDENTITY_LEN)
                        {
+                       al=SSL_AD_HANDSHAKE_FAILURE;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                                SSL_R_DATA_LENGTH_TOO_LONG);
                        goto f_err;
                        }
-               if (param_len > n)
+               if (i > n - param_len)
                        {
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                                SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
                        goto f_err;
                        }
+               param_len += i;
+
                /* If received PSK identity hint contains NULL
                 * characters, the hint is truncated from the first
                 * NULL. p may not be ending with NULL, so create a
@@ -1291,6 +1303,7 @@ int ssl3_get_key_exchange(SSL *s)
                s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
                if (s->ctx->psk_identity_hint == NULL)
                        {
+                       al=SSL_AD_HANDSHAKE_FAILURE;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
                        goto f_err;
                        }          
@@ -1308,14 +1321,23 @@ int ssl3_get_key_exchange(SSL *s)
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
-               n2s(p,i);
-               param_len=i+2;
+
+               param_len = 2;
                if (param_len > n)
                        {
-                       al=SSL_AD_DECODE_ERROR;
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
+               n2s(p,i);
+
+               if (i > n - param_len)
+                       {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
                        goto f_err;
                        }
+               param_len += i;
+
                if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
@@ -1323,14 +1345,23 @@ int ssl3_get_key_exchange(SSL *s)
                        }
                p+=i;
 
+               if (2 > n - param_len)
+                       {
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
+               param_len += 2;
+
                n2s(p,i);
-               param_len+=i+2;
-               if (param_len > n)
+
+               if (i > n - param_len)
                        {
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
                        goto f_err;
                        }
+               param_len += i;
+
                if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
@@ -1362,14 +1393,23 @@ int ssl3_get_key_exchange(SSL *s)
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
                        goto err;
                        }
-               n2s(p,i);
-               param_len=i+2;
+
+               param_len = 2;
                if (param_len > n)
                        {
-                       al=SSL_AD_DECODE_ERROR;
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
+               n2s(p,i);
+
+               if (i > n - param_len)
+                       {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
                        goto f_err;
                        }
+               param_len += i;
+
                if (!(dh->p=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
@@ -1377,14 +1417,23 @@ int ssl3_get_key_exchange(SSL *s)
                        }
                p+=i;
 
+               if (2 > n - param_len)
+                       {
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
+               param_len += 2;
+
                n2s(p,i);
-               param_len+=i+2;
-               if (param_len > n)
+
+               if (i > n - param_len)
                        {
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
                        goto f_err;
                        }
+               param_len += i;
+
                if (!(dh->g=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
@@ -1392,14 +1441,23 @@ int ssl3_get_key_exchange(SSL *s)
                        }
                p+=i;
 
+               if (2 > n - param_len)
+                       {
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
+               param_len += 2;
+
                n2s(p,i);
-               param_len+=i+2;
-               if (param_len > n)
+
+               if (i > n - param_len)
                        {
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
                        goto f_err;
                        }
+               param_len += i;
+
                if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
@@ -1451,12 +1509,19 @@ int ssl3_get_key_exchange(SSL *s)
                 */
 
                /* XXX: For now we only support named (not generic) curves
-                * and the ECParameters in this case is just three bytes.
+                * and the ECParameters in this case is just three bytes. We
+                * also need one byte for the length of the encoded point
                 */
-               param_len=3;
-               if ((param_len > n) ||
-                   (*p != NAMED_CURVE_TYPE) || 
-                   ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
+               param_len=4;
+               if (param_len > n)
+                       {
+                       SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
+                               SSL_R_LENGTH_TOO_SHORT);
+                       goto f_err;
+                       }
+
+               if ((*p != NAMED_CURVE_TYPE) || 
+                   ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
                        {
                        al=SSL_AD_INTERNAL_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
@@ -1498,15 +1563,15 @@ int ssl3_get_key_exchange(SSL *s)
 
                encoded_pt_len = *p;  /* length of encoded point */
                p+=1;
-               param_len += (1 + encoded_pt_len);
-               if ((param_len > n) ||
+
+               if ((encoded_pt_len > n - param_len) ||
                    (EC_POINT_oct2point(group, srvr_ecpoint, 
                        p, encoded_pt_len, bn_ctx) == 0))
                        {
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
                        goto f_err;
                        }
+               param_len += encoded_pt_len;
 
                n-=param_len;
                p+=encoded_pt_len;
@@ -1551,10 +1616,10 @@ int ssl3_get_key_exchange(SSL *s)
                n-=2;
                j=EVP_PKEY_size(pkey);
 
+               /* Check signature length. If n is 0 then signature is empty */
                if ((i != n) || (n > j) || (n <= 0))
                        {
                        /* wrong packet length */
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
                        goto f_err;
                        }
@@ -1647,7 +1712,6 @@ int ssl3_get_key_exchange(SSL *s)
                /* still data left over */
                if (n != 0)
                        {
-                       al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
                        goto f_err;
                        }